I am trying to add the buttons below to my custom object and lightning app but for the life of me I cannot find any information or way to add them to a custom object. Any help is appreciated!
2 answers
Steven Trumble (Strum Consulting) 
Forum Ambassador
Make sure activities are enabled then add the activity timeline component
https://help.salesforce.com/s/articleView?id=sf.tracking_activities_for_custom_objects.htm&type=5
