How to Add a Button in Salesforce Lightning

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Here's a comprehensive guide on adding a button in Salesforce Lightning:

1. Go to Setup > Object Manager. 
2. Select an Object (Eg. Account, Opportunity) and locate the Buttons, Links, and Actions section in the left pane.
3. Click the New Button or Link. Choose "Button" as the Display Type.
4. Edit an Existing Button (Optional): If you already have a button, select it and click Edit.
5. Configure the Button Details:

• Button Label: Enter a clear and concise label describing the button's function (e.g., "Submit for Approval," "Create Quote").
• Button Name: Provide a unique internal name for the button (alphanumeric characters and underscores).
• Content Source: Choose based on your button's action:some text
  • Visualforce Page: If your button triggers a custom action defined in a Visualforce page, select this option and choose the relevant page from the dropdown menu.
  • URL: If your button redirects users to a specific external URL, select this option and paste the URL in the designated field.
• Behavior: Define how the button opens the target (Visualforce page or URL):some text
  • Same Window: Opens in the current browser window.
  • New Window: Opens in a new browser window.
  • Replace Content: Replace the current page content with the target content.
• Availability: Choose when the button should be visible to users:some text
  • Available: Always visible.
  • On Edit: Visible only when the record is in edit mode.
  • On View: Visible only when the record is in view mode.
  • Customize: Set more granular visibility conditions based on field values or other criteria.

6. Add the Button to the Page Layout by heading over to the Page Layout in the left pane. 
7. Select “Buttons” to see your newly created custom button.
8. Drag and drop the custom button you created (from the left pane) onto the desired location in the page layout.‍
9. Save your changes.