Use custom column as a filter in dashboard

I have created a custom column one of question displaying in our dashboard.
Now, I want to use that custom column as a filter in my dashboard (as a dropdown list).
but I am unable to do that.

Also, it should be show as dropdown list (I have also select drop down list in data model setting for "source" column but it showing as search box)

Post Diagnosis:
{
"browser-info": {
"language": "en-GB",
"platform": "MacIntel",
"userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36",
"vendor": "Google Inc."
},
"system-info": {
"file.encoding": "UTF-8",
"java.runtime.name": "OpenJDK Runtime Environment",
"java.runtime.version": "11.0.12+7",
"java.vendor": "Eclipse Foundation",
"java.vendor.url": "https://adoptium.net/",
"java.version": "11.0.12",
"java.vm.name": "OpenJDK 64-Bit Server VM",
"java.vm.version": "11.0.12+7",
"os.name": "Linux",
"os.version": "5.4.0-1057-aws",
"user.language": "en",
"user.timezone": "GMT"
},
"metabase-info": {
"databases": [
"h2",
"postgres",
"mongo"
],
"hosting-env": "unknown",
"application-database": "postgres",
"application-database-details": {
"database": {
"name": "PostgreSQL",
"version": "12.7"
},
"jdbc-driver": {
"name": "PostgreSQL JDBC Driver",
"version": "42.2.18"
}
},
"run-mode": "prod",
"version": {
"date": "2021-09-09",
"tag": "v0.40.4",
"branch": "release-x.40.x",
"hash": "16d2e53"
},
"settings": {
"report-timezone": "Asia/Calcutta"
}
}
}

Hi @varnika
Sounds like you're seeing this issue:
https://github.com/metabase/metabase/issues/12985 - upvote by clicking :+1: on the first post
But since you're not using the latest version, then try that version first.