[itsme]

%%stretchlast 
Inserting %%stretchlast fixed the issue that the ABC line did not take the whole page width. I know about %%stretchlast and use it all the time for ABC sections that have more than one line. It just did not come into my mind as on my HP Detachable with the display in portrait orientation that issue was not there, no difference if %%stretchlast is included or not.

missing ABC line
Great that the issue with the disappearing ABC line is fixed.

MuseJazzText
I'm surprised that this happens as both LibreOfffice Writer and the ChordPro reference implementation can use MuseJazzText without issues. I admit it took several iterations until it worked properly in the ChordPro reference implementation. I ended with using the filename instead of the font name in ChordPro's config files:

Code:

"fonts" : {
// "name" is for built-in chords only. See https://chordpro.org/chordpro/chordpro-fonts/
//            "name" : "Times-Bold",
//            "file" : "MuseJazzText.otf",
//            "file" : "C:\\Windows\\fonts\\MuseJazzText.otf",
...
        "chord" : {
        "file" : "MuseJazzText.otf",
        "size": 13
        },
...

For MobileSheets:
I tried using the filename also in MobileSheets, without success:
%%gchordfont MuseJazzText.otf 30
%%gchordfont MuseJazzText.ttf 30

and I tried enclosing the font name in quotes, without success:
%%gchordfont "MuseJazz Text" 30

And I was able ro remove the blanks from the font names, as proposed by Vibraphon. I used FontForge (which is open source)
https://fontforge.org/en-US/   -   https://portableapps.com/apps/utilities/...e-portable
But I was not able to install that modified font version, Win 11 did not allow me to replace
c:\Program Files\WindowsApps\41730Zubersoft.MobileSheets_3.9.17.0_x64__ys1c8ct2g6ypr\Assets\Fonts\MuseJazzText.ttf
@Mike: 
any hint what I need to do to test my modified font? 
or shall I send you the modified font by e-mail?
I assume the fonts in the mentioned folder are installed by MobileSheets. Are they also available on other OSs?