Android Question Meaning of markers in coding UI

They match highlights in the same color that you can see in the code itself. The purple is for warnings and the blue is search or the automatic selection highlighting.

Move the scrollbar thumb to one of the indicators and you will see it.

Just move the scroll bar to the colour and see what the issues are, also look at the top half of the log screen, it's pretty obvious once you start matching everything up.

You may have a look at the B4X Booklets, especially B4X IDE, link in my signature.