Here is how to enable App Launcher in your Org:
Step 1: Submit a case to enable 'Enable Salesforce Identity' Org perm on the Org. Note that this step applies only to existing orgs. For new org sign-ups, this step is not needed.
Step 2: Admin needs to enable 'Use Identity Features' perm on the custom profiles or create a separate permission set with this permission enabled, and assign it to the users. For reference, this is how the 'Use Identify Features' permission is applied in Standard profiles:
Step 3: An admin needs to make the AppLauncher app visible from the profile or permission set by selecting the 'Visible' option in Custom App Settings.
Note that for Force.com - App Subscription (and any platform's legacy license) users only, this step will fail as standard apps aren’t allowed for this license. Follow these steps to provide access to AppLauncher for users with this profile:
000386082

We use three kinds of cookies on our websites: required, functional, and advertising. You can choose whether functional and advertising cookies apply. Click on the different cookie categories to find out more about each category and to change the default settings.
Privacy Statement
Required cookies are necessary for basic website functionality. Some examples include: session cookies needed to transmit the website, authentication cookies, and security cookies.
Functional cookies enhance functions, performance, and services on the website. Some examples include: cookies used to analyze site traffic, cookies used for market research, and cookies used to display advertising that is not directed to a particular individual.
Advertising cookies track activity across websites in order to understand a viewer’s interests, and direct them specific marketing. Some examples include: cookies used for remarketing, or interest-based advertising.