How can I Enable/Disable Frequently Bought Together section?

To Enable/Disable Frequently Bought Together section you need to follow below steps:

Manual Process
To Enable/Disable you have go to App Settings, click Sales Channel => Online Store => Customization => In Home Page drop down select Products => Click on Default Product => In Apps Section Click on Add block => In APPS add Frequently Bought block => In Title add and update heading => click on Save button on the top right corner.
Automated Process
To Enable/Disable Frequently Bought block section, Click on Activate App in Settings => In Apps click on Frequently block => In Title add and update heading => Click on Save button on the top right corner.