A specific Cubase approach to gain staging for loudness

Hello. I’m new Cubase user. I watched this video earlier today to learn how to gain stage in Cubase, but for the life of me I can’t seem to figure out how to use the pencil tool to draw the event-based volume envelopes the way that Dom Sigalas is performing @10:50 of his video. My pencil tool keeps creating new events over the parts when trying to draw my envelopes. I did refer to the manual, and many other videos and now I’m here looking for an answer. Is there a draw tool feature to enable to use it this way? What am I missing here? Is this only for the pro version of Cubase 10.5? Thanks!