Configuration:
$ cat .config/sway/config | grep opa
# opacity
set $opacity 0.97
for_window [class=".*"] opacity $opacity
$ cat .config/sway/config | grep disable
disable_titlebar yes
$ sway --version
sway version 1.9 (+ patch from https://github.com/swaywm/sway/pull/8026)Result (note the titlebar with tormath1@orchid:~):
Without transparency:
yes, master and 1.9 - are different beasts. Use this version for normal work.