Some storage space is missing after the installation of AsahiLinux

[HaoHan9717]

Hi there, I really like to use Asahi Linux so far. It is perfect and help solve multiple problems existing on macOS.
However, I recently found some of my storage space is missing. Here are the details:

During the installation, I have shrank the macOS and leave over 300GB for Asahi Linux. But then, after that step, I feel that the space of macOS is not enough any more. So after this resizing operation, I choose to allocate about 150GB to Asahi Linux.

In my opinion, since I only allocated 150GB to Asahi Linux, then the other half of that 300GB space should be returned to macOS, right? But then I checked the free space in macOS and find that it has still been shrunk by over 300GB.

I am not familiar with the operating systems. My questions is how do I get back that 150GB space on macOS again?

Thank you and I look forward to your reply.