Hello!
Here, you can download this Livesplit file, so that you can have splits with standardized split names for each mission and level part existing in the game. :) It also makes it easy for new runners to get a clean splits file, so why not?
Keep in mind that if you don't have a Livesplit layout with "subsplits" instead of "splits", the split names will have a dash displayed in front of each split name. This is because these splits have been made in such a way so that the dashes do not show up when using subsplits in a layout. It's also cleaner this way, in my opinion.
To have the dashes remove themselves, right click on your Livesplit window -> Edit Layout -> Click on the "+" symbol -> List -> Subsplits.
Hope this helps! Enjoy speedrunning! :D