Hey there,
The form rule run options are based on the actions you select. In this case, show action is not supported to be run when users click save. This is why this option is greyed out. You can read more about which actions are supported in which form rule run options in this help article - https://helpv2.quickbase.com/hc/en-us/articles/15342169525396-Create-a-form-rule.
Please make sure to add this as a feedback by using the "Give feedback" button on the left side of the My Apps page.
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Kristina Hristova
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