I think its a windows 11 feature to control tray icons via separate settings window, but on win10 it behaves differently and its gets hidden after restart even if i move it to front next to the clock.

In the Win10 Settings app search for "Select which icons appear on the taskbar", then ensure the Tixati icon is set to "On" on that screen. After a restart if that setting is changing back to "Off" then something is clearly interfering with your Windows settings being saved properly.

but it wont work for tixati only. other application tray icons work fine.

funny thing: my pc crashed and after restart the icon was where i wanted, then i shut down pc properly and started again - icon again hidden.

Not to be rude, but this seems to be more of a 'your computer problem' rather than a 'Tixati problem'.
Have you tried what the other poster recommended with the icon settings?
Has anyone else has this problem in Win10?

"but it wont work for tixati only. other application tray icons work fine."
that feature doesnt work with tixati the same way as the original problem.

Same issue.

This is a recent problem, it didn't use to be like this before.

I don't know if this is a tixati problem, or the fault of a recent windows update.