Why is the on screen keyboard and mouse pointer popping up when on Xbox could gaming? And...

Xbox allows keyboard and mouse, but it's the developer that builds it into their game. You can change pointer speed in settings, Devices & Connections, Mouse.

It's like the mouse pointer on your pc or laptop. If you make the settings to where the mouse pointer shows trails then this is a good example. The host is the mouse pointer and what you're shooting at are the trails and not the mouse pointer itself. That's
why it's not hard hitting a host that's running directly to the north or south of you but when it's in another direction it's tricky.

I meant that when u type using keyboard on xbox edge browser a pop on screen keyboard also appears which blocks the screen i was asking if their was a way to remove that pop up keyboard when using a keyboard

I personally would like a keyboard / mouse not to play games, but to enter passwords or to make my life easier any time the faux keyboard pops up on the screen and to perhaps do a bit heavier duty surfing on the built in IE.......

I appreciate you for sending us the photo privately. That helps me further isolate the issue.

The white dot you’re seeing on your screen when casting from your Samsung Galaxy Tab A7 to your Xbox One using the Wireless Display app could be a cursor or pointer from the tablet that’s being mirrored on the TV. This can happen if the tablet is interpreting the TV as an external display and showing a mouse pointer.

Here are some steps you can try to resolve this issue:

Check for updates again:

Make sure that your Xbox One, the Wireless Display app, and your Samsung Galaxy Tab A7 are all up to date.

Disable mouse pointer on your tablet: Some tablets have an option to disable the mouse pointer when connected to an external display. You can check this in the settings of your tablet.