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TECHNICAL DETAILS
ERROR:
Script error for: 5e53f0dc-de0c-4224-aeb0-f27fe39e7654_0.0.1/NewWebPartWebPartStrings
http://requirejs.org/docs/errors.html#scripterror
CALL STACK:
Error: Script error for: 5e53f0dc-de0c-4224-aeb0-f27fe39e7654_0.0.1/NewWebPartWebPartStrings
http://requirejs.org/docs/errors.html#scripterror
at B (eval at e (https://res-1.cdn.office.net/files/sp-client/sp-pages-assembly_en-us_76321800eff580162db09111ef3c3533.js:198:10299), :8:252)
at HTMLScriptElement.onScriptError (eval at e (https://res-1.cdn.office.net/files/sp-client/sp-pages-assembly_en-us_76321800eff580162db09111ef3c3533.js:198:10299), :30:244)
Hi Guenni,
Select the Classic toggle control -> expand the Property menu. You can specify the Default property as true or false like below: