Don't judge but we are still using classic. I have a handful of Custom Buttons on Accounts and Leads. It's my understanding that it's best practices to convert these to Quick Actions for lightning. I've done this and they seem to work.
Here's my question.... When I am in classic I only see the buttons, when in Lightning I see both. Is there a way I can edit the page layout etc so that I only see the Actions when I am lightning?
It would be MUCH simpler to just leave the custom buttons. What are the downsides to this?
To remove one of the buttons while in Lightning Experience, you can remove the button from the Salesforce Mobile and Lightning Experience Actions section. This enables the custom button that works both in Classic and LE to be shown just once.
As an alternative way, you can conditionaly render specific buttons by editing the Lightning Record Page: https://help.salesforce.com/s/articleView?id=sf.lightning_page_components_visibility.htm&type=5
Keep in mind that only custom buttons that execute javascript code are not supported in Lightning Experience
