Force-ending a turn is a PC-only mechanic that has also appeared in the previous games, and can be done with Shift + Enter.
This mechanic is frowned upon in multiplayer due to its exploitable nature. It allows you to skip everything that’s left to do on your turn, while saving up all your unspent research, culture, and production. For instance, if the civic for a wonder takes three more turns to be studied, you could use this mechanic to save up the production of a certain city for three turns, thereby saving three turns on building the wonder in that city once it can be built. Yields saved this way are only lost on age transition.
Force-ending turns can also delay celebrations and several other choice events, including having to support an ally that goes to war. However, you can't avert crises this way, as a crisis policy slot will automatically be slotted in for you if you try.