An administrator at Ursa Major Solar (UHS) has created a new Lightning record page for the sales team to display a report chart embedded on the account page. No record types exist for an account at th

Activating the Lightning record page as the default for the UMS app ensures that any user accessing records through the UMS app will see this page. Since no record types exist, assigning at the app level is the most direct way to establish a default view for the intended audience (sales team, implicitly using the UMS app), without affecting other teams who either use different apps or have other page assignment overrides.

Making the page the default object record page for the UMS app for the sales profile is a more granular assignment, but if the 'UMS app' itself is intended primarily for the sales team, setting the app default is a simpler and effective way to meet the requirement when no record types are present.

Making the page the 'Org Default' would apply the page to all users across the entire Salesforce organization, which would directly impact the support team and contradict the requirement to avoid that impact.

The question explicitly states that 'No record types exist for an account at this time,' making the creation of a record type for this purpose an unnecessary extra step and not the direct solution to setting a default page in the current context.