The Accept (RLS) Flow button must be added to the Page layout so that it is visible on the Proposal page.

To add the Accept Quote button on the Proposal page

  1. Go to Setup > Object Manager and search for the Quote/Proposal object.
  2. Click Quote/Proposal.
  3. In the left pane, click Page Layouts.
  4. Click Edit on the Proposal Layout row.
  5. Do one of the following based on the user interface.
    • For Salesforce Classic
      1. Click Buttons.
      2. Find the "Accept (RLS Flow)" button.
      3. Drag and drop the button in the Custom Button section.
    • For Salesforce Lightning
      1. Click Mobile & Lightning Actions.
      2. Find the "Accept (RLS Flow)" button.
      3. Drag and drop the button in the Lightning section.
  6. Click Save.