Show information message on the Edit field form that permissions are / can be configured in Field settings

I think the text should be in bold to be visible? Perhaps below the help text, before the "Reference type" selection?

This part could be difficult to implement, as we are hooking into the form from the outside. Adding the text at the front or the end of the "$form" isn't an issue, but if we want to add the info in the middle of the form, we need to slice the array first, insert our text and put the array back together.

I am unsure if this would be a wise idea 😅

OK, I couldn't finish this in time, but it is 99% implemented. The rest will come on Monday!

Done! I removed the links, as they need to be dynamically tailored to the current field, which I find a bit unnecessary, as the page can simply be reached by clicking on the Tab.

Thank you @Grevil, nice!

I'll add some minor fine-graded textual changes, then we're ready to merge this.
Did you check both cases (if / else) work as expected and the text only appears on entity reference fields?

I think tests would be too heavy here, a simple check should be enought.

Yes, works as expected. Please provide the text.

Oh forgot something, of course we need to make sure, that "$fieldStorage" is an instance of "FieldStorageConfig". If it is a base field, we do not have set / getThirdPartySettings defined!

I'll be right on it.

Alright! Only need the textual change now, so it can be merged! ;)

@Grevil: Please rebase and final review. I hope texts are as clear as possible now and I wanted to reuse the existing translation of the tab so they are === even if the translation changes ;)

Rebased, fixed and tested. RTBC!

Perfect, merged! :)

Automatically closed - issue fixed for 2 weeks with no activity.