Yes: you can press the top button for 7 consecutive seconds.
The LED will switch to purple after 3 seconds, don’t release now. The LED will then switch (7 seconds total) to blue, release now.
Wait a few seconds (10-20), the robot should be in hotspot mode again.
Other solution: you have a “Switch to Hostpot mode” button in Niryo One Studio, under the “Wifi Settings” tab.