Say for example you would like to hide the Estimate Revenue field from the form and make it available conditionally.
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Simple script to hide the field would display the form as shown below.
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To make sure that such empty spaces are not visible on the form, you can instead create 2 sections on the form, one with the Est. Revenue field and the other without the field.
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Through script you can then show/hide the entire section. This way the form layout is not affected.
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