Hi yabuniez,
Have created on-demand workflows for the entity, then you can view them after expanding flow button:


If you can't find 'Flow' button in the ribbon bar, you can check following settings:
1)Check security role: the "Run Flows" privilege in the Customizations / Miscellaneous Privileges

2)Navigate to Settings>System Settings>Customizations. Next, click on "Yes" under "Enable Microsoft Flow".

3)Go to PPAC Environments, select one environment > settings > Behavior:

Finally, If you don't want to use modern advanced find, maybe you can disable it and go back to classic modern advanced find:
-Go to PPAC Environments, select one environment > settings > Features

