Opening Tabs In One Window Only

Windows 10 user, latest Brave - was always able to open tabs in one window - as many as the computer could handle - until it put some unused tabs to sleep but that’s not a problem.
Now, since only a few days, each new tab opens a new window. Looked at settings - no help there. Can I get back to many tabs in one window, please?

It makes usage much faster, and more visible tabs are easier to handle - as in faster!
Great to have an alternative browser - also use it on my cell phone.