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If you don't know which one to choose, leave it as it is. If you want faster performance (which we recommend), select fixed sizeand then click Next. On the next screen, if you want a faster setup, select dynamically assigned. Select vhd(Virtual Hard Disk) and click Next. Select the Create a virtual hard drive nowoption and click the To createbutton to continue. Now, set the RAM size to at least 4GB (4096MB)and click Next.
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Now write a Namefor the virtual machine like macOS Big Sur, make sure that Writeis set to Mac OSXand the version isadjusted to Mac OS X (64-bit).Click Next. Launch the VirtualBox virtual machine and select New.
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Create a new virtual machine and configure
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