Geeqie

Perhaps the most useful image viewer and also in the Mint repository. Highly recommended.

sudo apt install geeqie

When you zoom in on an image the window does not automatically enlarge, however, it will zoom an image automatically to fit the window. It has many image zoom options and zoom memory. You can also hide any part of the interface such as the files view on the left. This is a better image viewer than the classic ACDSee 2.21 (not a linux software but runs well under wine.) Geeqie is a 5 star image viewer as of version 1.2.2