Open Themes section on the admin panel of your web store (Online Store → Themes);
Find Theme from the list which will be used with our installed app.
Click Actions → Edit Code.
on the section Layout in theme.liquid file delete the block that starts from
<!-- spurit_um-added →
and ends with the line
<!-- /spurit_um-added -->
in the Snippets section delete the file spurit_um-theme-snippet.liquid
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