If you are not blessed with a 1980x1080 screen like me, you can play with the default text file to put 2 UI tabs at the bottom and one in the original position by doing a "default.txt file edit.
I have mine looking like this in the pic below. The txt file edited looks like this..
For those that don't know the "//" causes the line not to be read in the game settings. Removing it"//" makes the line active.
//Toolbar position 0,0, (1 to anchor to minimap or 0 for no anchor)
//Default toolbars overlap and enabled via tabs/keys
//ToolbarsPos=0,0,0
//ForceAllToolbarsOn=FALSE
//HelmToolbarOffset=0,0
//DiveToolbarOffset=0,0
SensorToolbarOffset=0,0 <----make this line active by removing the double forward slash (left Tab)
Force all toolbars on in bottom horizontal row
ToolbarsPos=0,0,0
ForceAllToolbarsOn=TRUE <--- all bars active
HelmToolbarOffset=331,-346
DiveToolbarOffset=645,-346
//SensorToolbarOffset=953,-346 (this keeps the masts tab on the left)
I hope this helps somebody else with an older monitor like me!