How to get F-Droid to detect updates of itself - how to remove "ignored updates"? I'm using F-Droid and noticed that there are newer versions of the F-Droid app available that are not shown when F-Droid checks for updates.

I found that when looking at F-Droid's options > installed applications that F-Droid is listed there, but with a note "ignored updates" (maybe the wording is different, I'm using a translation).

On the App page, there is no "update" button, but just "start".

Is there a way to indicate that F-Droid also looks for updates of itself?

F-Droid came pre-installed with my Shift phone, so maybe, that's the reason why there is this setting.
The F-Droid App controls its own updating through an option within the app. When you start F-Droid, visit the internal settings in the "hamburger" menu ( the three dots). It can have its own updates restricted if the setting "Ignore All Updates" is checked. Uncheck this setting to allow F-Droid to maintain itself.