Start by going into Studio and:
On the template you want to delete click on the three little dots in the right upper corner
Click on delete template (as seen in the image below)
βNow it will come up with an "Are you sure" Simply click on this
..... And your template is deleted π
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Want to simply delete a layer? See this helpdesk βπΌ
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Or are you looking to delete elements from your Assets library in the template? See this helpdesk βπΌ