Sumatra PDF is a PDF, ePub, MOBI, CHM, XPS, DjVu, CBZ, CBR reader for Windows

How do I do these stuff?

How do I…

Hide the scrollbar when zoomed?

Set folders as default directories for comics?

Smoothen the scrolling for keyboard keys and mouse?

Rebind the keys for “Open next document in the directory” and “Open previous document in the directory”?

Speed up the scroll speed?

how do I do these stuff?? please help.

Most of those functions are windows sytem or hardware features and outside of SumatraPDF, I will answer the one that is, so when zoomed into a page like this epub, using pre-release or daily build https://www.sumatrapdfreader.org/dailybuilds.html, then I can use context or right button to control viewing scrollbars.
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Thank you so much!!! I’ve managed to fix one of my irks hehehe.