Log into the Symantec Endpoint Protection Manager and click on the Clients tab.
- 2. In the right-hand pane, click on the Policies tab.
3. Under Location-specific Policies and Settings, double-click Antivirus & Antisypware Policy and click Edit Shared.
4. On the Antivirus and Antispyware Policy page, click Administrator-defined Scans. Select the Advanced tab.
5. Under Startup and Triggered Scans, check or uncheck the following options:
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- Run startup scans when users log on
- Allow users to modify startup scans
- Run a Quick Scan when new definitions arrive
6. Click OK.
How to disable/enable Startup and Quick Scans within the Symantec Endpoint Protection Manager
https://support.symantec.com/en_US/article.TECH103044.html