Must manually exit grub menu at boot with Ubuntu 24.04

I had a 3 problems with using Ubuntu 24.04. I solved 2 of these by editing and updating the grub (adding 'snd_hda_intel.dmic_detect=0' to fix audio issues and 'i915.enable_dc=0 intel_idle.max_cstate=2' to fix display issues), and the third is far less inconvenient than the other two – it doesn't take much effort to type and enter 'exit' in the grub menu every time my laptop boots up, then wait for 10 additional seconds – but it would be nice to not have to do this on a regular basis.

As I did for the other problems I solved, I did a bit of research, installed Grub Customizer and... Well, I lost the post I followed and forgot what the two options I deselected were, but seeing the anomalous positions of two lines of code (I'm 50% sure that they didn't exist when I fixed the audio and display issues) and reading about these lines of code, I suspect that it added the last two lines of code below (I found another post and changed the timeout values to 0.1, but this had no visible effect):

GRUB_DEFAULT="0"
GRUB_TIMEOUT_STYLE="hidden"
GRUB_TIMEOUT="0"
GRUB_DISTRIBUTOR="Kubuntu"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash snd_hda_intel.dmic_detect=0"
GRUB_CMDLINE_LINUX="i915.enable_dc=0 intel_idle.max_cstate=2"
GRUB_DISABLE_OS_PROBER="true"
GRUB_HIDDEN_TIMEOUT="0"

This really is a very small inconvenience for me – it's responsible for only ~6% of the time it takes for my laptop booting up to the desktop environment having been set up (~3 minutes) – but if anyone knows a solution that saves me from having to type and enter 'exit' and wait 10 seconds every time my laptop boots up, I'd appreciate hearing about it.