If you add a regular expression validation to your field, you can use something like this ^([^\|]*|([^\|]*\|[^\|]*){0,6})$
to ensure no more than 7 options are entered.
The numbers at the end of the expression give you the minimum and maximum occurences.
An example of how I set it is below. I wanted - in this case to have no more than three options, so my numbers are {0,2}
:
![Usage example](https://kenticodraftproduction.blob.core.windows.net/7ab511c8-f1e9-4ec7-869e-397f28ad4e3a/27780343-3ea0-4171-b26f-2e2a2f215eb1/devnet_regularexpressionvalidation.png?sv=2017-04-17&sr=b&sig=KyOKSZ8ge0Qfap9RbLIzH5Ed6pGWlVozSjv0EtVm8BQ%3D&se=2027-10-31T13:39:25Z&sp=r)