30 pixel padding

Hello, I am editing the template of the “Pages”. In the editor, the template and also a sample created page is displayed to me in full width. However, when I save everything, the actual site is displayed to me with a margin on the left and right. Then when I examine the page in the browser, I find there:

<div class="wp-site-blocks"> [...] <main class="wp-block-group is-layout-flow wp-container-43 wp-block-group-is-layout-flow" id="wp--skip-link--target"> [...] <div class="wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained" style="padding-right:var(--wp--preset--spacing--30);padding-bottom:var(--wp--preset--spacing--30);padding-left:var(--wp--preset--spacing--30)">

Here there is once padding-right and padding-left with value 30. If I set the 30 to 0, the margin actually disappears. But there must be a setting for this in wordpress theme customizr somewhere or can it be that Blocland just always provides page templates with a margin of 30 pixels?

Thanks
Drongo