Looks like an X overlaid on an O 
Can I remove it? How?
It looks like the grid origin, you can set it to 0,0 from for example Place → Reset Grid Origin.
Further to @eelik 's comments:
The position of your cursor with respect to the Grid Origin shows in the middle bottom of your screen, under the workspace you will find this as X=something and Y+something.
The position of this Grid Origin denotes X=0 & Y=0 with respect to your cursor.
Along side X & Y are dx & dy. The position of the cursor, when you press the Space Bar, becomes a Local Origin with the value dx=0 & dy=0.
Both X & Y and dx & dy are useful for placing and drawing and measuring.
What jmk describes is “local origin”, but it’s different from the Grid Origin. See for example
More about origins here: Coordinate system, grid and origins in the PCB Editor
Aha! Thank you very much
Hi @perdrix
I edited my above comments to make more sense.
The Coordinate System FAQ, linked above, needs some updating, especially with respect to the Drill/Place Origin.