The slideshow view is still in an early stage of development with only a basic set of features.
If you don’t need the auto-advance mode, you could even use the sticky preview feature instead.
spacebar start and stop auto-advance mode which automatically switches
to the next images every five seconds by default.
ESC leave slideshow mode and return to lighttable view.
+ or increase delay between each image.
- or decrease delay between each image.
right arrow or switch to the next image of the collection.
left arrow or switch to the previous image of the collection.
Hint: To take full advantage of your screen size, put darktable into fullscreen mode by pressing F11 and hide the border-controls by pressing the B key.