You can create a template from an existing ruum in two ways: From your lobby and while using the ruum:
From your lobby
To create a template from an existing ruum from your lobby, click Options - Create Template from Ruum:
While using the ruum
To create a template from a ruum you are currently using, click Information, then click Options - Create Template from Ruum:
With both options, the ruum is now saved as a template and you are taken to the Edit Template Mode screen.
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