[BackOffice] [SOLVED]Top menu suddenly disappeared and I get 3 points on the right top

[Nina]

I still use PS 1.6.1.24, as I like it very much.

A hour ago, top menu suddenly disappeared and I get 3 points on the right top of the screen of the BackOffice.
I just worked on editing products.

Is there any any way to restore the old top menu?
I made many searches in the forum and Googled for any answer - but I could find nothing.

Please Help if possible!

Thanks in advance,

Nina

(edit) It happens just in Firefox, any other browsers work correctly)

Edited February 9, 2022 by Nina
adding information (see edit history)