GitHubRulesOK

That's different but similar comments for mobi etc. You need to be using latest pre release and one problem sample per issue. There were no comments system for epub/mobi (only...

to INVERT colours pressing SHIFT + `I` usually works in PDF and others but beware all objects including images will be reversed unlike say older version 3.1.2 where mobi images...

You are using 3.5.2 as I see from the wooly icons so there it is not shift but just `I` and too easily accidentally pressed so 3.6 **pre-release** has better...

Hmmm there are many complaints about Windows 11 printing wrong pages . HOWEVER in Book view or Facing view numbers are not always seen correctly compared to single page mode....

You will need to test current pre-release and here I rotated page then added underline no problem 

Poor file (© NCERT not to be republished) seems many odd copies on the web but assume the one in question is similar to https://ncert.nic.in/ncerts/l/kefa104.pdf  

For comparison how long does the same command take in acrobat reader ? It is likely to take longer unless acrobat is constantly showing as pre loaded into maximum working...

Either PDF or PNG you can set as the default handler Normally Edge is default for PDF and Paint for PNG    

@Michellehdr I have no idea other than running **install** should have added it 

It should not be that slow, since a slow printer would be at least 10 ppm e.g say 6 seconds each. But it is not down to SumatraPDF which simply...