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It is true, the knob is quite slippery; anyway try this: Quit Nisus Thesaurus if it is running. Then, from your Home Library/Containers/com.nisus.NisusThesaurus/Data/Library/Saved Application State/com.nisus.NisusThesaurus.savedState (Folder), delete the files: data.data window_1.data window_2.data ...

You have to drag down the dot between the search box and the definition box:

In Bibliography Options in the Format Manager for APA 7th, check the Case options; it may be that the drop-down menu is at "small CAPS":

Here is how my APA 7th appears:

What format is applied to the bibliography?

I agree this is undesirable.
I had made a feature request for this Find option. I have Jedit Ω which has the option to not share Find strings with other apps:

You can find Nisus macros here:
https://nisus.com/pro/macros/

Nisus Writer Pro version 3.1:
Changed: jumping to a note reference should place the insertion point after the reference, not select it entirely.

You can use this online PDF to PDF/A Converter:
https://www.pdftron.com/pdf-tools/pdfa-converter/
1. Select the type of PDF/A from the drop-down menu
2. Upload your PDF file.
3. Download PDF/A of the file.

If you still have Wintext app on Classic MacOs, you can salvage the text as explained in this post:
https://nisus.com/forum/viewtopic.php?p=17932#p17932

From System Preferences:Keyboard, tab to Text and uncheck “Correct spelling automatically”.

What you describe can only happen when a left-to-right script language paragraph style is applied to the selected text.
To overcome the problem, the paragraph style applied should have at least "Language: Arabic" attribute:

If the text is entirely in Arabic script, is Arabic language applied to the paragraph style (from the flag menu in the Stausbar)?
Are you working with a text which was copy-pasted from another source?
Is another script direction involved?

Keyboard Viewer will only show you the layout of the active keyboard. To view Arabic keyboard layout, you have to make the Arabic keyboard active from the input source in the menubar. If Arabic does not appear in the inpt source, you have to add it from System Preferences>Keyboard>Input Sources: Inp...

It is interesting to note that when I export your Nisus file as Word binary, and then open the converted file in Nisus, the PICT images were converted to PNG. It seems that the LibreOffice exporter used in Nisus handles the conversion of PICT images to PNG. Of the 36 images of the original file, the...