Equations displaced on the screen

[Paolo M Pumilia]

Equations with labels appear largely displaced on the right side of 
the lyx window on the screen, as pointer switches focus from the 
math mode of that equation to the text display mode.

(Equations are correctly centered with numbers on the right, when my 
file gets printed out).

Using lyx 2.2.3 on linux suse
Here included a test document.

thank you
Paolo

test-equation.lyx
Description: application/lyx