New answers tagged list-button
0
You can add button in related list, normaly Change Owner and New buttons are shown by default in child related list for a custom object. However I don't quite understand your question, if you can't find the buttons like new and others in related list popoup in object page layout, try minimizing the fields tab, the buttons tab starts after that.
2
Remove the line breaks. It's not called out in the release notes and examples always seem to show line breaks (for readability) but line breaks do not work.
/lightning/o/CustomObject__c/new?defaultFieldValues=Name={!Account.Name},Client__c={!Account.Id}}
This is called out in this article, but I've also run into the same issue.
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