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Old 04-26-2026, 11:59 AM   #1
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Preview font size increasing
Updated to 9.7 recently, and I have notice that sometimes the preview pane font size increases, apparently spontaneously. Looking at the preferences, nothing has changed, but the only way to get the proper font size back is to close the book I'm editing and open it again. I don't know what I do that triggers this. Is there a way to stop it from happening?
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Old 04-26-2026, 02:06 PM   #2
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Quote:
Originally Posted by Phssthpok View Post
Updated to 9.7 recently, and I have notice that sometimes the preview pane font size increases, apparently spontaneously. Looking at the preferences, nothing has changed, but the only way to get the proper font size back is to close the book I'm editing and open it again. I don't know what I do that triggers this. Is there a way to stop it from happening?
No need to close what you are editing. All you have to do is hold the CTRL key and move the mouse wheel and it will change the size of the text. Also, this is not a calibre 9.7 issue. I've had it happen on older versions of calibre. It's a QT issue.
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Old 04-26-2026, 08:13 PM   #3
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Not a Qt issue. Under the covers the Preview panel is a web browser (Sigil editor too), ditto the calibre viewer. Ctrl+mouse wheel to zoom has been a feature of every browser I've used since I can't remember when.

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Old 04-26-2026, 09:01 PM   #4
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https://github.com/kovidgoyal/calibr...c682c88a1a97d3
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Old 04-28-2026, 10:56 AM   #5
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Quote:
Originally Posted by JSWolf View Post
No need to close what you are editing. All you have to do is hold the CTRL key and move the mouse wheel and it will change the size of the text. Also, this is not a calibre 9.7 issue. I've had it happen on older versions of calibre. It's a QT issue.
What a pity I don't have a mouse wheel...
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Old 04-28-2026, 11:14 AM   #6
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Originally Posted by BetterRed View Post
Not a Qt issue. Under the covers the Preview panel is a web browser (Sigil editor too), ditto the calibre viewer. Ctrl+mouse wheel to zoom has been a feature of every browser I've used since I can't remember when.

BR
I reported a similar issue way back and was told it was a QT issue.
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Old 04-28-2026, 05:20 PM   #7
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calibre editor and viewer use QtWebEngine - Qt Wiki

Quote:
Qt WebEngine integrates Chromium's fast moving web capabilities into Qt.
BR
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Old 04-30-2026, 04:07 AM   #8
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Quote:
Originally Posted by BetterRed View Post
calibre editor and viewer use QtWebEngine - Qt Wiki



BR
Apparently (since I don't have a mouse wheel on my laptop) the solution is supposed to be Ctrl-0 to return to normal size... but that doesn't work either. Does anyone have any other ideas?
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Old 04-30-2026, 04:28 AM   #9
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What about Ctrl+ and Ctrl- or this:

Click image for larger version Name: calibre - viewer controls - font size.jpg Views: 34 Size: 37.9 KB ID: 223004

or this:

Click image for larger version Name: calibre - viewer settings - font size.jpg Views: 43 Size: 339.0 KB ID: 223005

BR
Last edited by BetterRed; 04-30-2026 at 04:41 AM. Reason: Add third option
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Old 05-02-2026, 02:49 PM   #10
Phssthpok
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Quote:
Originally Posted by BetterRed View Post
What about Ctrl+ and Ctrl- or this:

Attachment 223004

or this:

Attachment 223005

BR
Ctrl+/- don't work either (Ctrl-0 is supposedly reset zoom to normal size).

The images you posted don't seem to have anything to do with the preview pane in the editor... unless I'm missing something? The first one looks like something from the viewer, not the editor, and the second one looks like you're editing some JSON configuration file. (And frankly quitting editing and opening the book again looks easier to me than fiddling about with the config settings mid-edit.)

Kovid, any chance of passing ctrl-0/+/- through to the previewer instead of them being swallowed by the editor? AFAICS none of them do anything useful. Or maybe provide a button to reset the zoom in the toolbar at the bottom of the preview panel?
Last edited by Phssthpok; 05-02-2026 at 02:59 PM.
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Old 05-02-2026, 03:00 PM   #11
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Kovid: Sorry, I'm playing catch-up here and I just saw your Github fix. Exactly as I wanted!
Last edited by Phssthpok; 05-02-2026 at 03:06 PM.
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