Gave up trying to hide Grub2 text menu and Grub2 boot messages with both YAST and manually editing.
Here is my /etc/default/grub, compiled from different internet topics:
I do not see grub menu with these options, and I see 2 seconds wait before boot continues. I am using graphical mode (GRUB_GFXMODE). You probably need to explain in more detail what do you see or provide photo/video.
This does not leave you any time to invoke menu which rather defeats the idea of hidden timeout.
I suspect the OP is talking about still seeing the few lines of text showing linux kernel loading/booting before moving on… I turn off the theme here and no plymouth.
Users may want to configure bootloader from unchanged /etc/default/grub owned by package grub2. Steps for creating a boot menu:
rm /etc/default/grub # install preserves existing version
zypper install --force grub2 # installs unchanged /etc/default/grub
yast2 bootloader # unchanged tabs are stale, change at least one option on each tab
erlangen:~ # cat /etc/default/grub
# If you change this file, run 'grub2-mkconfig -o /boot/grub2/grub.cfg' afterwards to update
# /boot/grub2/grub.cfg.
# Uncomment to set your own custom distributor. If you leave it unset or empty, the default
# policy is to determine the value from /etc/os-release
GRUB_DISTRIBUTOR=Tumbleweed-nvme0n1p3
GRUB_DEFAULT=saved
GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=3
GRUB_CMDLINE_LINUX_DEFAULT="spash=silent quiet mitigations=auto"
GRUB_CMDLINE_LINUX=""
# Uncomment to automatically save last booted menu entry in GRUB2 environment
# variable `saved_entry'
# GRUB_SAVEDEFAULT="true"
#Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
# GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"
#Uncomment to disable graphical terminal (grub-pc only)
GRUB_TERMINAL="gfxterm"
# The resolution used on graphical terminal
#note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
GRUB_GFXMODE="auto"
# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
# GRUB_DISABLE_LINUX_UUID=true
#Uncomment to disable generation of recovery mode menu entries
# GRUB_DISABLE_RECOVERY="true"
# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"
GRUB_DISABLE_OS_PROBER="false"
GRUB_ENABLE_CRYPTODISK="n"
SUSE_BTRFS_SNAPSHOT_BOOTING="true"
GRUB_USE_LINUXEFI="true"
GRUB_CMDLINE_XEN_DEFAULT="vga=gfx-1024x768x16"
GRUB_THEME="/boot/grub2/themes/openSUSE/theme.txt"
erlangen:~ #
# If you change this file, run 'grub2-mkconfig -o /boot/grub2/grub.cfg' afterwards to update# /boot/grub2/grub.cfg.
# Uncomment to set your own custom distributor. If you leave it unset or empty, the default
# policy is to determine the value from /etc/os-release
GRUB_DISTRIBUTOR=Tumbleweed-nvme0n1p6
GRUB_DEFAULT=saved
GRUB_HIDDEN_TIMEOUT=2
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=0
GRUB_RECORDFAIL_TIMEOUT=$GRUB_HIDDEN_TIMEOUT
GRUB_CMDLINE_LINUX_DEFAULT="resume=/dev/disk/by-uuid/... quiet splash=silent loglevel=3 rd.systemd.show_status=auto rd.udev.log_lev>
GRUB_CMDLINE_LINUX="console=ttyS12"
# Uncomment to automatically save last booted menu entry in GRUB2 environment
# variable `saved_entry'
# GRUB_SAVEDEFAULT="true"
#Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
# GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"
#Uncomment to disable graphical terminal (grub-pc only)
GRUB_TERMINAL="gfxterm"
# The resolution used on graphical terminal
#note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
GRUB_GFXMODE="auto"
# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
# GRUB_DISABLE_LINUX_UUID=true
#Uncomment to disable generation of recovery mode menu entries
# GRUB_DISABLE_RECOVERY="true"
#Uncomment to get a beep at grub start
# GRUB_INIT_TUNE="480 440 1"
GRUB_BACKGROUND=
GRUB_THEME=/boot/grub2/themes/openSUSE/theme.txt
SUSE_BTRFS_SNAPSHOT_BOOTING="true"
GRUB_USE_LINUXEFI="true"
GRUB_DISABLE_OS_PROBER="true"
GRUB_ENABLE_CRYPTODISK="n"
GRUB_CMDLINE_XEN_DEFAULT="vga=gfx-1024x768x16"
Both messages are displayed unconditionally. The first is SUSE specific patch shown before menu and the second is output when grub executes selected menu entry. Selecting menu style or timeout only affects whether menu itself is displayed - these timeouts do not change what is displayed before menu nor what commands inside menu entry print on screen.
If you really want to get rid of them, you need to edit scripts in /etc/grub.d and remove code that generates them.
So i could remove messages from 2-nd screen, blinking cursor and locale error message, but welcome message and “press t” string are still there. Can’t remove them.