XnView Software

What are the recommended settings for XnConvert to save disk space without losing quality?

I have hundreds of images such as .png, .jpg, .jpeg, .gif to convert and they are taking up a ton of space

So I'd like to know how to use XnConvert to disk space, help is appreciated.

I'd like the option or capability for XnView to browse multiple folder directories at once.

It's a pain having to browse one directory at a time

I have searched everywhere in XnView and its options, but I can't find a way to show my files in groups.

Vista and Windows 7 can group files by type, which make it easier to find and categorize photos I'm searching for.[

I'd really find it useful to group files by type, name, date, and that kind ...

I have XnView 1.97.8, and I want to know if there is a way to change or customize XnView's hotkeys, I want to use n for next file, p for previous file, and other basic actions and functionalities