Disable and Enable SLA
If you have SLAs you don't need, you can use the Disable/Enable SLA feature instead of deleting them. The button is located in SLA configurations in the upper-right corner.
Note that when you try to Disable SLA, specific changes will occur, namely:
SLA will no longer be visible in reports, selectors, and task panels.
If SLA is used in Saved Views, it will disappear from them.
Custom fields are removed from the project, and the Custom Fields feature is disabled (if they are configured in SLA and this is a classic project), it is possible to turn it on again in the enable status.
Execution of all SLA goal actions will be canceled.
SLA will no longer be included in calculations for the Chart external link.
It will cease to apply to the project's previous and new tasks.
If the operation is successful, you will receive a corresponding message.
When returning SLA to Enable status:
SLA will reappear in reports, selectors, and task panels.
SLA will return to Saved Views and can be displayed.
Custom fields configured in SLA settings will be reinstated.
Execution of all SLA goal actions will be re-enabled.
SLA will now be considered in calculations for the Chart's external link.
It will be applied and recalculated for tasks within the project's scope.
Also, wait for the message about success.