Thanks for replies as thought it was just me.
It takes up entire screen near enough so running it when box is likely to be in use may be more of an issue.
The built-in ABM doesn't do it so was kind of hoping it was a simple thing to sort! Obviously not.
I have two options I can think of:
1. Live with it but ensure TV volume is turned down low before going to bed so I don't hear TV on for the minute.
2. Go back to OpenVix's ABM and live without official channel numbering within G-EPG (which was main reason why I moved to AB 28.2).
I may forget about turning volume down before bed so will have to take option 2