You can open sheet settings by clicking on the gear icon.
The gear icon may not be visible if you have too many sheets in you projects,. When that happens, you should just click on the arrow icon to see the settings.
In this part you can create new sheets, and also rename, rearrange and delete sheets.
To create a new sheet, write the sheet title in the "enter sheet title" and click on +.
To rename it, just click on pen icon to activate edituing mode.
When you’re finished, click on Done to save changes.
Expand: Change how you view your list.
Rename: Change name of your list.
Move: move your lists between sheets.
Archive: archive the lists you don't use anymore.