How do I stop Orca from initiating on startup? [Mate Desktop]

I appreciate using Orca *sometimes* but rarely require its usage. However, everytime I reboot and utilize an audio device I must run the following command to turn off Orca:

killall orca

How can I prevent Orca from starting on startup? It is not within the startup applications: How can I repair this? I am utilizing PopOS with Mate Desktop Environment. Thank you all so much!