Text goes beyond the screen on mobile devices.

Hello,

Ad Inserter basically only inserts the code you configure.
The code is wrapped with a div element, therefore its content defines the size – the style by default only defines block margins:
https://adinserter.pro/documentation/alignments-and-styles

You did not provide the information required to check the plugin settings:
https://wordpress.org/support/topic/ad-inserter-support-forum-before-you-ask-for-help/

The issue has nothign to do with Ad Inserter.

You are inserting elements that are wider than the available template width.
For example, in block 7 you are inserting a 728×90 banner:
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6MTejY4GpnezZxpBfiCe_dUmfArl1B8-rDM8a220OLSxjm5lqKVYlWsbovsq8O6XQQtpjaJypC9kjkUd5XPbLmkp6ZvYE4hFDKf5fEdlhDWt1EAYcwlFSLW38NEpExqc-PG8C0J0vL0nHxK6dynj2V6FsiOc0sUnN4eNvXsW4RqzJ0gqIH-A66PRf/s16000/b-ls1.png

The same in Block 6:
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6MTejY4GpnezZxpBfiCe_dUmfArl1B8-rDM8a220OLSxjm5lqKVYlWsbovsq8O6XQQtpjaJypC9kjkUd5XPbLmkp6ZvYE4hFDKf5fEdlhDWt1EAYcwlFSLW38NEpExqc-PG8C0J0vL0nHxK6dynj2V6FsiOc0sUnN4eNvXsW4RqzJ0gqIH-A66PRf/s16000/b-ls1.png

You can use device detection to insert ads based on the device (viewport width):
https://adinserter.pro/documentation/device-detection

You are also using AdSense responsive code which resizes ad blocks to the width determined by the oversized elements listed above.
If this code still causes isses with overflow then use ad units with fixed ad sizes:
https://adinserter.pro/documentation/adsense-ads#code-generator

Make sure the code you are inserting will fit into the available width and then the rest of the content will also fit into the parent container.