Thank you for your reply. In browsers there is a horizontal scroll bar available at the bottom of the window. There is a windows setting that hides them or enables them, under Acessibility. Even with that changed to allow them, there is no horizontal scroll bar. And I would like to ask if that option is meant to work in Firefox, please.

Does it make a difference if you reset the page zoom or zoom out ?

Can you scroll horizontally with holding Shift and rotate the mouse wheel ?

Not able to Shift and mouse to scroll. The page Zoom does not change the behavior. It is the same issue in a different browser, as well. Wondering if anyone else has the same issue.