You can choose a set of templates saved in your sandbox space by using an appropriate sandbox prefix. For example, if you want to preview a version of ꯇꯦꯝꯄ꯭ꯂꯦꯠ:Test that you have saved as "ꯁꯤꯖꯤꯟꯅꯔꯤꯕ:Foo/sandbox/ꯇꯦꯝꯄ꯭ꯂꯦꯠ:Test", use "ꯁꯤꯖꯤꯟꯅꯔꯤꯕ:Foo/sandbox" as the prefix.