Although contain-values is not supported in the builder, you can manually edit the FetchXML (under the Data
tab) and add the following condition/filter:
<condition attribute="new_testmultiselect" operator="contain-values">
One issue I noticed, if there is only one value, it does not pick it up and throws an error. If you add the same value twice, the filter will start working (ie. the snippet above has the same value twice to avoid the error). If you have more than one value in the condition list, you do not need to repeat any.
Please also note, you will not be able to use the FetchXML builder while the above snippet is present. If you need the builder, remove the snippet and add it back in when you are done with the builder.
If you have any questions, feel free to reach out to support at firstname.lastname@example.org or join one of our daily Q&A sessions.
Thank you kindly,
TPC Application Consultant