Colleges can address this partially through Display Logic Rules that hide specific resource types (see sections and by limiting the New_Discovery_Network search profile to physical materials (see sections ;

some colleges have noticed that requests can still be placed if patrons access the resource from databases outside of Primo VE: see issue demonstrated in recordings https://clo-collaboration-spaces.atlassian.net/wiki/spaces/RSIP/pages/1369243679/Humber+-+Discussion+Page?focusedCommentId=1513291777

Humber Colleges has suggested addressing this through the link resolvers for each database: https://clo-collaboration-spaces.atlassian.net/wiki/x/AYAUWw

Conestoga College has addressed this through css to add persistent navigation in their example of an in-link

requests for electronic resources should be automatically cancelled in Alma (“cancelled by staff” status) and patrons will receive the Ful Cancel Request letter

some colleges have chosen not to limit their search results to physical materials in Primo VE or block requests for electronic materials so that their ILL departments can address the requests with partners outside of Page 1+ or through purchase requests: see Primo VE settings for Resource Sharing (RS) - best practices?; https://clo-collaboration-spaces.atlassian.net/wiki/x/AYAUWw