When you click the landscape mode or tap Shift+3 works together with this button “G” that is hiding billboard spline, etc. When you come out of landscape mode all icons, billboards, splines, etc. do not appear. It is necessary to press “G”
Hi Hichigo,
Thank you for submitting a bug report. I have reproduced this issue and logged a report for it here. You can track the report’s status as the issue is reviewed by our development staff.