Different Default Landing Tabs for Users in Salesforce Lightning Experience App

In Salesforce Lightning Experience, there is no built-in setting to enforce a single default landing tab for all users on standard Lightning apps. A user's default landing tab in Lightning Experience is determined by the default landing tab of the last Salesforce Classic app they used before switching to Lightning.

Why Different Users See Different Landing Pages

Each user's default landing tab in Lightning Experience inherits the default tab setting from whichever Classic app they were last in before switching to Lightning. For example:

• User A was last in the Classic Sales app, which has the Home tab set as its default. After switching to Lightning Experience, User A lands on the Home tab.
• User B was last in a custom Classic app with the Contacts tab set as its default. After switching to Lightning Experience, User B lands on the Contacts tab.

Workaround: Set a Consistent Default Landing Tab Across Classic Apps

If you want all users to land on the same tab when switching to or logging into Lightning Experience, set the same default landing tab on all Salesforce Classic apps. This ensures that regardless of which Classic app a user was last in, they will land on the same Lightning tab.
Exception: This workaround does not apply if the Lightning app assigned to a user's profile specifies a custom object tab as its default landing page.
To set a default landing tab on a Classic app, see Create Custom Apps for Salesforce Classic.
To set a custom object as the default tab in Lightning, see Make Custom Object the default tab in Lightning.