Is your external SSD partitioned into multiple drives? Are you saying that your SSD is reported to be 129GB by the OS?
Back in the day I used to use Synergy to have one mouse and keyboard across multiple monitors and OSeshttps://symless.com/synergy/software-kvmI could seamlessly scroll across 3 monitors pushed by 3 different computers.
Is your external SSD partitioned into multiple drives? Are you saying that your SSD is reported to be 129GB by the OS?