In Advanced Search, allow filtering OUT specific locations. For example, allow use of the filer: Physical Location "IS NOT" X.
Many searches do not allow for an "IS NOT" operator, and in some cases it is greatly missed. For example, when trying to assemble large sets of records where you want to exclude just a few locations, or filter out a single library. Please allow for an "IS NOT" operator when doing an advanced search and filtering by location or library. I'm sure there are other search filters also missing the "IS NOT" operator. Please feel free to add more suggestions via a comment! :)
Alma team is analyzing to which indexes it is possible to add the “is not” and other negative comparators. In addition, there is a new feature coming called refined search which allows using indication rules created by the users (see Ability to search via free text MARC tag and subfields idea, NERS 2020).
Sean Purcell commented
When doing an "electronic titles" search there is no "IS NOT" operator for "electronic collection name". Please add the IS NOT operator here. Interestingly, when doing an advanced search of "electronic collections", you CAN say electronic collection name "IS NOT" X.