Currently, the latest version does not have the following commands. It can only be operated by Ctrl+click, which is very inconvenient! It is hoped that the following operations will be added to the command list to support shortcut key operations.
Do you mean Command pallete doesn’t show the command?
If so, my guess is that you are focusing on the file explorer or something. What commands are listed in Command pallete changes depending on the current state of Obsidian (where you are focusing on, what type of view you are opening, reading/editing view…), so it will be not shown in the list under some circumstances. But the command still exists. Focus on one of your markdown note, open Command pallete, and type “Split right”.