How to open projects as tabs in IntelliJ

Question

Can anyone please let me know how to open multiple projects as tabs in IntelliJ.

In my previous laptop I am able to do. Please find the attached screenshot.

However, in my new laptop whenever I try open multiple projects, it always open in a new window rather than in tabs like above.

Answer 1

"In macOS Big Sur projects can be opened in separate tabs, both in full screen and normal state. This feature is available when Prefer tabs when opening documents option in macOS preferences is set to always" (Jetbrains https://youtrack.jetbrains.com/issue/JBR-2893). This is shown in the first image:

In order to open the project in the same window, change the IntelliJ preferences seen in the secondimage