How can I display "recent folders" in the sidebar of "Save as" dialogue?
Solution 1:
This feature has been removed by the developers.
As a workaround you may press alt+R when the Save as dialogue pops up. This should list recent folders you have used to save files.
Solution 2:
A workaround in addition to the answer of pomsky:
With a little hack, you actually can add "Recent" to your bookmarks. This way, "Recent" will be available in the "Save As" dialogue. Drawback of the hack is that "Recent" will appear twice in Files and in the GTK3 File Open dialog, once at the top above your special user folders, and once as a bookmark.
Open
~/.config/gtk-3.0/bookmarks
in a text editor.Add a new line (I suggest as the first line), containing
recent:///
Save and close the file.
Next time when you start Files afresh, you will have a "Recent" bookmark, that also will show in the GTK3 file dialogs.