Deselecting time signatures

Consider
image
If I select the time signature C and Reset Appearance (RA) it reverts to 4/4. OK. Logical.

If I click in the bar;
image
and RA, C remains. OK. Logical since C is not selected.

If I Select All and ALT-click C (to deselect it) and RA it reverts to 4/4. Why?

If I select all and filter out C (to deselect it) and RA it reverts to 4/4. Why?

Should not C remain if it is not selected?

I’m using D4.3.

TIA.

Do you happen to have any signposts selected?

You probably need to make a system selection in order to filter out the time signature. (It will turn black if deselected, not blue)

No, I hide those just to be sure.

Yes, if I click the first bar in RH and the last bar in LH the time sign. are not selected (black). I thought I could Select All and then filter out the time sign. with the Edit/Filter menu but they remain blue for some reason, while if the same for Text objects they become black. Perhaps there is some “hidden connection” to the time sign. that text objects (and slurs etc.) do not have?