How do you enable external user sharing in sharepoint online?

Sure, here are the steps to enable external user sharing in SharePoint Online:

1. Sign in to the Microsoft 365 admin center as a global or SharePoint admin.

2. In the left-hand menu, select "Show all" then "SharePoint" under Admin centers.

3. In the new SharePoint admin center, select "Policies" from the left-hand menu, then "Sharing".

4. Under the "External sharing" section, you can choose the type of sharing you want to allow.

   • Anyone: This allows users to share files and folders with anyone. If this setting is selected, users can send a sharing link that anyone can use.

   • New and existing guests: This allows users to share files and folders with people who aren't in your organization's directory.

   • Existing guests: This allows users to share files and folders with people who are already in your organization's directory.

   • Only people in your organization: This doesn't allow any external sharing.

5. After you've made your selection, click "Save".

Remember, the settings you choose here will apply to all sites in your organization. If you want to change the settings for specific sites, you can do so in the "Active sites" page of the new SharePoint admin center.