A quick but useful tip I found hidden in this video:

https://www.youtube.com/watch?v=iwJnZQFi_C8

At around 24:00, the speaker notes the use of opacity: using multiple layers, and lowering the opacity of the front/uppermost layer to verify map alterations across different data sets (“data sets” being the layers themselves i.e. Bing, Esri, Maxar etc.). A tip I’ve already had good success with. I find lowering the opacity to around 70% works nicely.