When selecting features the Digitizer Tool is not selecting anything, only select by polygon works

I have a workspace with line and area layers. Today for some reason the Feature Info Tool (Circle with i) and the Digitizer Tool (pencil) cannot select any features. But when I use the Select by Drawing Polygon tool, it can find all of my features.
So I must have inadvertently changed a setting but I cannot seem to determine what setting and how to get the usual behavior back.
So I must have inadvertently changed a setting but I cannot seem to determine what setting and how to get the usual behavior back.
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