Unable to Change the Widget Size

Changing a widget’s size by long-pressing the minical app icon or an existing widget (to switch to a different size or type) is not supported in minical.
(This OS feature only resizes the same widget type. Because minical offers many different widget types, please add a new widget of the desired type instead.)
We recommend adding a new widget by following Apple’s steps:
How to add and edit widgets on your iPhone - Apple Support
With widgets, you get timely information from your favorite apps at a glance on your Home Screen, Lock Screen, or Today View.
You can use widgets without upgrading to minical pro.
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