I have a new laptop (lenovo thinkpad) and somehow Mabox doesn´t remember my 1920x1080 screen resolution setting. When I go to the LXRandr settings it already shows the 1920x1080 tab but I have to click apply and save. Not a deal breaker as I love Mabox so much, but if someone could help me that´d be awesome.
I did not find this exact content. However, it showed my prefered resolution (1920x1080) in the autostart file but still I had to click apply in the settings. Anyways, I did what muzqs suggested in the comment below and that worked. Thanks so much for your help though
~/.config/openbox/autostart contains those 2 lines by default. They just examples - commented out because output names and needed resolution may be different.