Hi,
I observed an rendering issue with Helix Ultimate Template using Joomla 4.
When I start the view in portrait mode on my mobile device (either iPhone or iPad) and turn to landscape view, the header region (with logo and mobile menu) remains in the previous size, filling only half of the display width. Reloading the page recovers the view.
The other way round, starting with landscape and turning the device to portrait works well.
I provide you with 3 pictures showing this effect.
https://drive.google.com/drive/folders/1XbDOJfJ7kuf9U-im340r5eU5d6Eo1OTU?usp=sharing
You may also have an own trial with your mobile device on
https://www.fotoclub-leonberg.de/
Best Regards