XnView Software

I have been using various Ubuntu versions for many years but had no occasion until now to install anything other than from a repository.
The download page offers three different packages for Linux.
Can anyone advise me on which version to use?

Many thanks for the detailed explanation! That's just what I needed.
Ratio was already enabled, but so was everything else, which had pushed it off the right edge of the screen.
Apparently all columns are enabled by default. This is a bit annoying: I am rarely interested in more than a few items ...

Since I am trying to crop most of my photos to 16:9 (for display on my HTPC monitor) it would be helpful to have an overview of the aspect ratios of pictures in a given directory.
I couldn't find aspect ratio in Windows 10 properties and I haven't been able to get it in XnView MP's thumbnails. I do ...

looks good, thanks!

See the hyperlinked text "this directory" in my original post.

"FInd similar files" is unreliable when examining photos converted from HEIC to JPG

Effect: duplicate photos are not identified.

To reproduce:
1. Open this directory in XnView MP.
2. Click on "Tools" - "Find similar files".
3. Select "Similar image content".
4. Set similarity to 60%.
5. Click "OK ...

The identification of duplicates is corrected in 1.9.0. However, the misidentification of non-duplicates remains.
Specifically, with a threshold of 60%, XnViewMP 1.9.0 identifies P1000017.JPG and 2009-10 Mediterranean Cruise 908.jpg as a 46% match, but only with the option "between folders only", as ...

Based on https://giannirosato.com/blog/post/jpegli/ it seems that JPEGLI is the best encoder to use, but what about the other settings, e.g. DCT Method, Subsampling, etc.
Any advice is welcome!

XnView: MP 1.8.7 - Windows 64 bit
OS: Windows 10 64bit

FInd similar files is unreliable when the option "Between folders only" is selected.

Effect: non-duplicates are erroneously marked as 100% identical, which can lead to their accidental deletion.

To reproduce:
1. Open this directory in XnView ...

I find XnView's "Find similar" function very useful, but I sometimes give it too big of an assignment. If I change my mind and try to Cancel the operation, XnView MP generally doesn't respond to the Cancel button. This often leaves me no other choice but to force a hard shutdown, by holding down the ...

Sorry, my bad. In XnView MP 1.8.2 it's at the top of the first ("Caption") tab of the "Edit IPTC" dialog (Ctrl-I in "View" mode). The field name is "Document title".

I found it at the bottom of the first pane. YMMV.

@Gerald,
I am using all 3 of these options, and would settle for any of them in the "Find similar files" results view.
However, what I had in mind when I made the suggestion was the "Labels" from the "Thumbnail" settings.
This is also what I most often refer to.

I take way too many pictures and make too many backups. XnView MP's "similar files" feature saves me a lot of time cleaning out similar and duplicate pictures. However, there is one feature I am missing. The results view helps me to compare the pictures, but I often have copies of the same picture ...

Perfect, thanks!