Lookup not showing in my SP form

I added the lookup control in my SP form.
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And made the below settings -
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After saving, this is what I'm getting. I don't have the drop-selection.

Am I doing it wrong. Please help. Thanks again!

Hello @Jamail_Serio,

Please completely clear the browser cache.

Also check the app package version in the app catalog
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If it's below 1.0.8.1, you'll need to update the app package. You'll find the instructions here:
Update the app package for Plumsail Forms (SharePoint Online) — SharePoint forms