Atom causes ubuntu freeze

Hello, i have problem. I just open atom with 3 tab (index.html, main.scss, html preview) it’s going normal. But after around 5 minutes i see in ‘system task manager’ > ‘process’ there is >= 10 atom process and each atom process was used 300MB RAM usage and 5% CPU usage. That’s what make my laptop freeze and i got error ‘ubuntu out of memory process killer’.

What causing atom has many process ? Thx anyway

ATOM 1.50
Ubuntu Mate 20.10