According to this issue, it looks like there are no plans, understandably, for making a version/fork of nsxiv but with native Wayland support.
Any recommendations for a simple image viewer in Hyprland?
Unfortunately, --all isn’t an option. The following options are available in swayimg:
Mandatory arguments to long options are mandatory for short options too.
-r, --recursive read directories recursively
-o, --order=ORDER set sort order for image list: none/[alpha]/random
-s, --scale=SCALE set initial image scale: [optimal]/fit/width/height/fill/real
-l, --slideshow activate slideshow mode on startup
-f, --fullscreen show image in full screen mode
-p, --position=POS set window position [parent]/X,Y
-g, --size=SIZE set window size: [parent]/image/W,H
-a, --class=NAME set window class/app_id
-c, --config=S.K=V set configuration parameter: section.key=value
-v, --version print version info and exit
-h, --help print this help and exit