Hi,
You should not use itween, it is outdated and laggy.
Try using
DOTween, you can find the actions
hereIn editor mode are you using your device with unity remote or are you using your mouse?
for your off-topic you can use playerprefs :
@ start use 'playerprefs has key'
if false, make a key (use any "SET" playerprefs actions)
if true, skip what you want only the 1st time