Step 1: Place your cursor before the word of the sentence you would like to come on the next line and use the keyboard shortcut shift + enter to split the line.

Step 2: You can also right-click and select split segment here.

Click on add segment after to add a blank box and you can type out the new sentence here.

Merging will only work for lines in the same scene.

Step 1: Place your cursor before the word of the sentence you would like to merge with the previous line and use the keyboard shortcut ↑Shift + ←Backspace to merge the line.

Step 2: You can also right-click and select merge with the next.

Make sure to click on spply Changes once you make your edits and preview your video!