RE: Lookup field only shows one column
Hi everyone, thanks for the response.
I have checked your suggestions and there is no irregularity in the customization that might cause this. However, I accidentally found the fix.
In the form editor, if you open the lookup field properties, you can select the lookup view to be displayed by the lookup field.
What I did was I selected another default view, save, publish. After I did that, the lookup field shows 3 columns normally. I change back to the originally selected lookup view, save, and publish. Lo and behold, the lookup still shows 3 columns. This is the screenshot of the problematic instance after I applied that 'fix'.
It's all working as intended now.
Thank you for your responses guys, I really appreciate your time.