Here are the step to do Screen Sharing in Slack for free using Dead Simple Screen Sharing.
Step 1: Install Slack App
Press the above button to add the app to Slack
Step 2: Create a Meeting
After the app is added to Slack you can easily create a meeting right from Slack by just typing /screenshare in slack
Visit the meeting url and share it with the participants so that they can also join.
Step 3: Done!
That’s it! By following the above steps you have successfully created a Dead Simple Screen Sharing meeting right from Slack.