I can't find "Widget Styles" in new version. I want change "Toolbars" to "Small Mixed Size Buttons" like in 3.19 and i just can't do it anymore. Can't change "buttons" and "menu" to "Text Only". Where is all this options now ?

Those options were removed in v3.21 to match Fopnu and DarkMX, but v3.22 should be out today or tomorrow and it will have some widget styles available. They will be in Settings - Behavior.

still missing text + icon option, can this be added again please?
thank you so much for your hard work

Can you tell me...
1. what's the difference between Fopnu and DarkMx ?
2. Is all this software from one developer ?
3. Does he have another software ? (exept Fopnu, DarkMX and Tixati)

the main difference is that DarkMX runs over TOR and Fopnu runs on the Fopnu network.
yes
The developer made WinMX and he also makes Super Simple Server.
https://supersimpleserver.com/

It was driving me nuts too trying to find the main button settings!
So they're gone now...Well I guess the current look is what makes Tixati Tixati afterall.
(But it sure would be nice to have the buttons changed to a real menu and toolbar.)

@Janet, I'm using v3.25, under Linux, but I do not see anything which looks like Widget Styles.  Am I missing it, or....?
Thank you.

Look in Settings-User Interface-Behavoir
Show icons with menus and/or buttons