Hello, @harky
You can run up to a maximum of 4 different workspaces of Mattermost in a single go on the Android app using:
- The stable version - https://play.google.com/store/apps/details?id=com.mattermost.rn&hl=en&gl=US
- The classic version - https://play.google.com/store/apps/details?id=com.mattermost.mattermost&hl=en&gl=US
- The beta version - https://play.google.com/store/apps/details?id=com.mattermost.rnbeta&hl=en&gl=US
- Web browser
The official feature is still in the works here - https://mattermost.atlassian.net/browse/MM-11067