Salesforce Custom Object Tab Not Visible For Users

All editions:

• If the Custom Object is still in the status of "In Development" it will not be available. Follow the steps below to check the status of the object.

           In Salesforce Lightning Experience UI

1. Select the gear icon | Setup
2. Go to the Object Manager
3. Select the name of the object
4. Click Edit
5. In the section "Deployment Status", ensure it is set to Deployed then Save

In Salesforce Classic UI

1. Go to Setup | Create | Objects
2. Click the name of the Object
3. Select Edit
4. In the section "Deployment Status", ensure it is set to Deployed then save

Professional, Enterprise, and above Editions:

If you've checked User permissions and the tab is still hidden, check the following:

• The tab may be hidden for the Profile. Go to the User's profile and change it to Default On.
• Check if the Object permission checkboxes are checked for the profile (Read/Write/Delete/View All Records/Modify All Records). If they aren't checked, then check the boxes as per your business requirements.

• If the User has a Standard Profile, you need to create a Custom Profile and then give the "View" permission so that the Custom Object tab is accessible by the User. The Custom Object tabs are not visible for Standard Profiles. Alternatively, you could create a Permission Set that allows this access and assign it to the individual users.
• If the Custom Object is on the Detail side of a Master-Detail Relationship, then the Master Object is not visible to the user.
• Users can also modify their own tab settings under the User settings. This could also cause Tabs to be hidden for some Users. Related documentation: Customize Your Tabs in Salesforce Classic