How in the world is Find Replace "broken" in any way?
Text buttons have been replaced by icon buttons and a series of checkboxes has been replaced by a pulldown menu of check boxes.
This frees up space for better use on screen limited laptops and older systems. Just think how much space those text based check boxes and buttons used up when translated into many languages other than English. It left no space on smaller screens for any of the docking widgets (like Preview).
And just how hard is it to think of "Find" when seeing a magnifying glass? Or "Count" when seeing a number sign? Then replace vs replace all become painfully evident.
And most importantly, no functionality has been lost. In fact, a highly requested feature "limit to text only" checkbox has even been added, along with 2 new find replace dialogs: "Dry Run ReplaceAll" and "Replacement Chooser".
The icons used can be changed by using different Sigil themes and even a custom theme is possible. See
https://github.com/Sigil-Ebook/IconThemes for more info.
No actual functionality has changed. If you are seeing breakage of any sort, my guess is your desktop theme is interfering in some way or some other system or Qt breakage has happened as the code itself has not changed. Find and Replace works exactly like it did in the previous release.
The only valid complaint made so far was that the newer icons might be too small for some people with accessibility issues. We have already made them 50% wider for the next release.
Being overly dramatic about a ui change from words to icons on buttons is just absurd!
If instead actual functionality has broken, then calmly report the bug and give details about your system and how to recreate what you are seeing (the breakage) and we will track it down and get it fixed.