It may or may not be 5.4 at all. Maybe it just happened. The main editor panel cannot be removed and that makes sense. To the left of the editor panel I like to put full-length (but narrow) file browser. To the left of the file browser I put full-length (but narrow) TOC. The TOC and file browser are not tabbed, but both are showing. To the right of the editor panel I placed full-length file preview. Across the screen from left to right are TOC, file browser, main editor window, file preview. There are no tabs.
I experimented with non-tabbed stacking file browser and TOC. This works okay. I was also able to insert full-screen-width (but vertically short) above and below the main editor window. The program creates a blue-tinged place holder position for dropping (1) tabbed, (2) above, and (3) below, but no longer accepts an untabbed full-height position left or right. There is something going on that now forces the tabbed state and no longer allows the next-to state.
I have been zigging and zagging the boxes here and there and everywhere to see if there is a strange sequence of key presses. So far, no luck. Best regards, Pop
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