Watchlists and source folders have different purposes. Source folders are primarily designed to browse and download data while watchlists are designed, as the name says, to “watch” stock tickers.
Although you can use a source folder the way you would use a watchlist, source folders are sometimes less flexible. For example, it is not possible to add or remove sub-folders inside a source folder.
Follow this tutorial to get the flexibility of a watchlist for the data of a source-folder.
In the sidebar, under WATCHLISTS, click Create new watchlist….
Give a name to the new watchlist then press ENTER.
In the sidebar, under the TICKERS section, select the source-folder you want to use as a watchlist.
Choose Edit > Copy.
In the sidebar, select the watchlist you created in Step 1.
Choose Edit > Paste.