How to deactivate flow through WorkBench?

Hello Shubham,

you can use the workbench Migration feature to deactivate flow through workbench.

you can refer below given Link :

https://help.salesforce.com/articleView?id=000221117&type=1

Hi,

You may need to deactivate a process in an org, for example, when a process is installed using a managed package and that process references a custom object that isn't in the target org. In this case, the process is active and can't be edited using the Process Builder.

​Follow these steps to deactivate a process.

1. Log into Workbench. Read more here about Workbench.

2. Use Workbench to retrieve metadata components and then download those components in a .zip file.
Read about Metadata for more information.

3. Modify the flowDefinition file (contained in the .zip file you downloaded) by specifying a value of 0 in activeversionNumber.
Note that the flowDefinition file is available only in API version 34 and later.

Example package.xml file contents to pull the initial Flow Definition file:

Hope this helps.