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Sarita Pa 3Sarita Pa 3 

Field Width on Quick Action On the Lightning App Page

Hi Team,

Could you help me to reduce the width of the field on the quick action layout. These are the steps what i followed and the field which i am referring to
Step 1: Create a Lightning App Page on record page.
Step 2: Select and drag 'Record Record' on to the component.
Step 3: Create a quick action as 'Update Record' and add this to the 'Related Record' which is created as part of Step 2.
Step 4: On the layout the fields are showing more in width.

I am trying to see the field width should be half of the layout.User-added image
ShirishaShirisha (Salesforce Developers) 
Hi Sarita,

Greetings!

Can you please check the sample code from the below document:

https://developer.salesforce.com/forums/?id=9060G0000005j4xQAA

Kindly let me know if it helps you and close your query by marking it as solved so that it can help others in the future.

Warm Regards,
Shirisha Pathuri