Hi Peter,
Greetings from Syncfusion support.
We have validated your reported problem. Unfortunately, we were unable to replicate your reported problem at our end as Dashboard Layout works properly within flex-container element without any issues.
We have attached our validation sample for your reference.
Please, check the above sample and let us know whether it helped you resolve your reported problem or else please provide us more details to replicate your reported issue at our end.
If possible, please share us a issue replicated sample. This information would help us to find the cause of your reported problem and to provide you the prompt solution.
Please, check out the following links to know more about Dashboard Layout component in Vue platform.
Please, let us know if you need any further assistance.
Regards,
Shameer Ali Baig S.