How in Unity to make some object shown only 1 time?

Question

Unity

For example, a player enters the game, and information about a recent update is shown there, he presses the close button and that's it, and continues to play the game, and the next time he enters the game it is no longer shown.

Answer 1

For this, PlayerPref is used to save data locally to the registry (multi-platform).
PlayerPref Get - check the parameter whether the window was shown, if not, show it and then PlayerPref Set

Answer 2

It is easy to do such things, for example, you can save the settings to a file, or your menu is represented by a game scene. where obviously there are variables, and this same variable can be assigned to the display flag. where when you start the game, you load the scene again