If you’re using the Obsidian flatpak, then you can pass --js-flags="--nodecommit_pooled_pages" into ~/.var/app/md.obsidian.Obsidian/config/obsidian/user-flags.conf:
$ cat ~/.var/app/md.obsidian.Obsidian/config/obsidian/user-flags.conf
--js-flags="--nodecommit_pooled_pages"
$ flatpak run md.obsidian.Obsidian
Debug: Found user flags file "/var/home/jstone/.var/app/md.obsidian.Obsidian/config/obsidian/user-flags.conf" with args "--js-flags="--nodecommit_pooled_pages""
Debug: Enabling Wayland backend
Deleting cache directory: /var/home/jstone/.var/app/md.obsidian.Obsidian/config/obsidian/GPUCache
Debug: Will run Obsidian with the following arguments: --js-flags="--nodecommit_pooled_pages" --ozone-platform-hint=auto --enable-features=WaylandWindowDecorations --enable-wayland-ime
Debug: Additionally, user gave: