Hi Everyone,
I am unable to see "Create site workflow" option although I am added under "Allowed workflow designers".
Below screenshot taken from different web application.
All necessary Nintex features are activated in site collection features and have permission.
Thanks in Advance !!
Prashant
Prashant,
Check if the the Site Feature (not just site collection), for Nintex Workflow 2013 has been activated .
Site Settings >> manage Site Features.
Hello Prasanna,
Its already enabled. Still I am not able to see. 
As of now I am generating URL manually and using it.
Create Site Workflow Link
site_url/_layouts/15/NintexWorkflow/WorkflowDesigner.aspx?Category=Site
Manage site workflow link
site_url/_layouts/15/NintexWorkflow/WorkflowGallery.aspx?Category=Site
Schedule site workflow link
site_url/_layouts/15/NintexWorkflow/WorkflowSchedules.aspx
You can try deactivate and then activate the Nintex Workflow features at the site level (don't forget to perform a backup before deactivating the features).
Hope this helps
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