How to activate a flow in SalesForce Lightning flow builder?
Activating a flow in SalesForce flow builder can be done in the setup process automation menu, where it is necessary to create a new view to be able to add a flow in the view using the flow builder, where it will also be possible to run the flows.How to create a workflow in SalesForce workflow
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Once the flow will have been added to the view using the flow builder, it will be possible to activate it by running it in the flow builder screen.
See below in details how to create a flow and active it in SalesForce Lightning .Flow Builder - Salesforce Help
Access the SalesForce account setupAdd custom object to navigation bar
Once in the setup menu, the easiest way to access SalesForce flows and activate some of them is to use the search bar to find the flows option.
Creating a new view for flows
The first step to be able to activate a flow will be to create a view, by clicking on the create new view link.
A view name and a view unique name will have to be provided, and it will be possible to add several filter criteria if necessary.
Finally, select the fields that will be displayed in that view to create, such as: flow API name, is using an older version, template, type, namespace prefix, built with, flow label, description, last modified by, last modified date, and is active.
Finish the view creation by clicking on the save button.9 Tips for Using Salesforce's Lightning Flow the Right Way
Creation of a new flow
Now that a view has been created, add a new flow to that view by using the new flow button.
Using the SalesForce flow builder
Using the SalesForce flow builder to activate new flows starts by clicking on the start button, which is displayed in the flow builder from the beginning.
A form to create a new assignment will be displayed, in which several information can be entered: label, API name, description, and the possibility to set variables values.
After the different assignments required for your project will have been created using the SalesForce flow builder, continue by clicking on the save button to activate the corresponding flow.
Activating a new flow in the flow builder
Save the flow newly created with its corresponding assignments in the flow builder by entering a flow type, which will be one of the following:
Contact Request Flow,
Field Service Mobile Flow,
Field Service Snap In Flow,
After having selected the right option, leave the flow builder and activate the flow by saving the flow under creation.
Activating the flow created in setup
Once flows have been created, activate them by ticking the corresponding box under the is active option of the flows list.
Then, if the flow is marked as inactive, click on run to activate the SalesForce flow from the flow builder screen.Lightning Flow Builder: A how-to guide with examples - Medium