PDF

Adobe Acrobat - https://get.adobe.com/reader/

DjVu

DjView - https://sourceforge.net/projects/djvu/

FB2, EPUB

Calibre 4.23.0 - https://download.calibre-ebook.com/4.23.0/

Version 4.23.0, because later versions are slow, and earlier ones have a bad font.

Alt+Left - go back after clicking on the hyperlink.

Esc - menu. Suitable font size is usually 22 px.

Preferences:

Scrolling behavior->Show scrollbar

Miscellaneous->Remember last used window size and position

Miscellaneous->Keep a copy of annotations/bookmarks in the e-book file, for easy sharing. Untick.