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Legacy mode gets disabled on its own and in place of it Secure Boot gets enabled automatically ( triple boot alongside Windows 10)

System: HP-250 G3
I’m running my system in Triple boot (Windows 10, Linux Mint,Manjaro). I installed Manjaro recently.
Before the installation of Manjaro, I don’t have to enable Legacy Mode (in Boot Options) each time I start my device. Linux Mint and Windows were working fine
But now if I want to boot into Manjaro instead of Mint or Windows I’ve to enable Legacy Mode each time

legacy Mode gets disabled automatically after I shut down and remove the power cable

Suppose I’ve enabled Legacy Mode this time then the very next time
I try to boot, the System doesn’t show the Manjaro GRUB bootloader
Menu
. It shows the message :

Selected Boot Image did not authenticate. Press < enter> to continue

Then the system shuts down and next time I boot, Linux Mint GRUB
BOOTLOADER
shows with the options :

  • Linux Mint
  • Windows
  • Manjaro

But when I click on Manjaro, the screen simply freeze at hp . The
other two work fine
To make Manjaro Work I’ve to enable Legacy
Mode

Imp Note:

  1. I’m able to access all 3 OS when Manjaro GRUB shows . But I can access only Mint and windows 10 when Linux Mint GRUB shows , even when the Legacy Mode is enabled
  2. I can reboot my system any no of times without changing the Legacy settings, if the power cable is plugged
  3. I don’t have a battery in my laptop

Things I’ve done:

  • I’ve already set Manjaro as first boot priority
  • Changed the bootloader to grub (this I did during Mint Installation)

If I can get a way to make Legacy Mode permanent (i.e. permanent until I change manually) ?
Thank you in advance