What is the process for creating vertical videos?

[Mix26536474cf7i]

Could you please tell me how to create a vertical video for Instagram or TikTok?
I cannot change the size of the project when I want to change the setting.
My new project cannot be customized when I go to "new project". There are preconfigurations I have to choose from.
Thank you for your assistance!

[Steve Grisetti]

Here you go, Mix! Look about 1:20 in.

[Ann Bens]

Which version are you using?