Ubuntu 20.04 Gnome Tweaks not showing options for keyboard 3rd level character

Question

Using 20.04, I installed Gnome Tweaks to use the L Alt key in place of R Alt key to access 3^rd level character in a modified keyboard (á, ç, ñ, é, è) by editing the xbd/us file.

When I go in Tweaks “Additional Layout options”, it gives me only 2 options:

• “Number 4 key when pressed in isolation”,
• “Number 9 key when pressed in isolation”.

In my other similar machine, I get a whole list of choices.

I reinstalled Tweaks a couple of times, to no avail.

The only difference between the 2 is that the other one have a regular US keyboard, not modified.

Thanks for any input!

Answer 1

I found the answer to my question ! I just had to turn off "Show extended input sources" and bingo, I got the whole list for 3rd level character key.

Merry Christmas to all.