Here's the situation.
I activated Topic Custom Fields addon.
Also, I have completed and activated the settings that apply only to the selected forum A.
Then, 'Filter by custom fields' began to appear active on the search page. (attached image)
I entered a search word and clicked the search button. However, it was not clicked.

I was able to check two things in this situation.

One is that disabling Topic Custom Fields Addon will make search work normally.
On the other hand, I selected all the required options for 'Filter by custom fields', and the button was clicked.

Can you check this problem?

Also, I would like to deactivate 'Filter by custom fields' on the search page.
What code should I insert into my child's theme file(funtion.php)?

Thank you for your help.