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The “Share only Sys IDs listed” option will allow you to share only the sys ids specified in the bulk share. This way, instead of having to specify conditions to find certain sys ids, you can list the actual sys ids here and then the bulk share will run to only share those records.
A “Sys IDs” related list is provided in the Related Links section where you can enter the sys ids you want to bulk share (“Record Sys ID” is the record's sys id in the table).
Note that when the “Share only Sys IDs listed” option is selected, the condition filters option will be hidden and disabled since the bulk share will only run on the sys ids listed.