last month , i went to all the environment variables inside my Dev environment's solution and i set their Export checkbox to No. but today i check those settings since i added a new environment variable, and i noted that all the solution environment variables inside my Dev environment have their Export checkbox set to Yes, as follow:-

any advice why those were changed automatically for me? now i want to set them to No, because i want to export the solution from Dev to PROD environment. any advice why this happened and how i can avoid this in the future? and did anyone face this issue recently ? Also i unchecked those yesterday >> do the export >> but today all the checkboxes are checked again!!