First, search the help docs and this forum. Maybe your question has been answered! The debugging steps can help, too. Still stuck? Delete this line and proceed.
What I’m trying to do
Is it possible for Obsidian not to show links to images in my outgoing links?
There is no native way to hide them in the sidebar.
Might try Settings > Files and Links > Excluded Files and write in a regular expression such as /.*?\.(jpg|jpeg|png|gif)/. Not sure if all images in all attachments folders will be picked up. They should be.
You’d need to restart Obsidian and let it reindex your files.
The downside is that you won’t see your images in the Quick Switcher and other places. The images would still be available in the Files tab, of course.
I don’t recommend going down this road, BTW.