Save the current boxes as a named preset and load it later from the Preset menu, or export and import presets as JSON files. Copy to Clipboard copies the same JSON, so you can paste a wall into a chat and the other person loads it with Import from Clipboard.
Build a wall from YouTube links
Copy a list of YouTube links and choose Preset → Import from Clipboard. Put one link per line. Words before a link become the box name:
Morning Stream https://www.youtube.com/watch?v=dQw4w9WgXcQ
Backup Feed https://youtu.be/dQw4w9WgXcQ
https://www.youtube.com/live/dQw4w9WgXcQ
Loading or importing a preset replaces the current boxes, as does New Preset, which leaves a single empty box. Each can be undone with Undo for 8 s. The Preset button shows the name of the preset you loaded or saved last.