I personally use Zathura, it’s minimalistic and uses VIM bindings.
But if you want something feature-dense, with a way of organising your library, eReader integration, file converting and more, Calibre is pretty amazing (and the actual reader part of Calibre is quite nice to use in my opinion).
Did you add the pdf to your Calibre library and open it or did you open it from somewhere else?
If you need a tool to remove and rearrange PDF pages, maybe give PDF Arranger a try? https://github.com/pdfarranger/pdfarranger
Personally I use SumatraPDF.
Can read both PDFs, ePubs and even the djvu format. And its really lightweight, unlike the bloated monster that is Adobe Reader.
For Android, the ReadEra app, because it’s the only darn ebook app I could find that allows a scrolling mode instead of page flip. And you can add the Twilight app also to change screen temp, and extra dim mode in the dark. It works really well.
For e-ink ereaders, I don’t know what the best one is right now. Definitely not Kindle though. And Kobo has overdrive library integration. But e-ink in general is very nice for reading. Definitely go for 8 inches or more in screen size though if you want to read manga. Also physical page turn buttons are really nice.
KOReader, though most people will probably find the UI off-putting at first.
Thing is, it’s perfect for use on an e-ink device, which is what’s it’s primarily designed for. The desktop (Linux and Mac) and Android versions are just icing on the cake, and they all work the same and can sync reading activity between them. Tons of features, options for tweaking book layouts, plugins for integration with other services, some integration with Calibre, etc. It takes the “kitchen sink” approach and I love it. I’ve found spending the time to learn it to be really rewarding.
Looks cool. I’ll do some research but seems like it might be possible to install this on Kindle? How would one do that…
KOreader http://koreader.rocks/