If your website is not displayed correctly in mobile version, please check the following options:
The default Jimdo mobile version ( design> mobile view ) in custom layout should be deactivated as shown in screenshot:
If you're using an old template ( installed before 2022), In Settings> Edit Head section you should have the viewport tag. Please make sure you haven't deleted it:
<meta name="viewport" content="width=device-width, initial-scale=1"/>
The viewport tag in new Matrix themes can be found directly in HTML. This has been made in order to avoid mistakes in Edit Head section.
If your website is not responsive, you might have made an error in CSS. In this case you need to replace the original CSS files