I am having problems with the layers, I have had the same issue through 18/19 and now version 2020
It is a simple thing but annoying
1) I cannot rename a layer. I click rename and the name is highlighted but unable to change it as if it is locked somewhere. I make sure that the layer is not locked before hand
2) If I create a new layer 5 times out 10 it will just create a layer ( called Layer 1 ) and then I am unable to rename it so its delete and try and again. If you do not immediately start typing it reverts to being called Layer 1 or if Layer 1 is already used it calls it Layer 2 etc but unable to change the name !!