sudo rpm-ostree install akmod-nvidia xorg-x11-drv-nvidia
sudo rpm-ostree kargs --append=rd.driver.blacklist=nouveau,nova_core --append=modprobe.blacklist=nouveau,nova_core
sudo rpm-ostree kargs --delete-if-present=rd.driver.blacklist=nouveau --delete-if-present=modprobe.blacklist=nouveau --delete-if-present=nvidia-drm.modeset=1

Grub with theming and manual add Windows boot

/boot/grub2/user.cfg

set timeout=5
set gfxmode=3000x2000,auto
insmod gfxterm
terminal_output gfxterm
insmod gfxmenu
loadfont ($root)/grub2/themes/fedora/terminus-12.pf2
loadfont ($root)/grub2/themes/fedora/terminus-14.pf2
loadfont ($root)/grub2/themes/fedora/terminus-16.pf2
loadfont ($root)/grub2/themes/fedora/terminus-18.pf2
loadfont ($root)/grub2/themes/fedora/ubuntu_regular_17.pf2
loadfont ($root)/grub2/themes/fedora/ubuntu_regular_20.pf2
set theme=($root)/grub2/themes/fedora/theme.txt

menuentry 'Windows Boot Manager (on /dev/nvme0n1p1)' --class windows --class os $menuentry_id_option 'osprober-efi-6A5C-0BA7' {
    insmod part_gpt
    insmod fat
    search --no-floppy --fs-uuid --set=root 6A5C-0BA7
    chainloader /efi/Microsoft/Boot/bootmgfw.efi
}

Get de EFI boot partition with lsblk -f. In this case the EFI partition for Windows is 6A5C-0BA7

lsblk -f |grep FAT32
├─nvme0n1p1 vfat   FAT32                2BEC-6036                             586.3M     2% /boot/efi
├─nvme1n1p1 vfat   FAT32                6A5C-0BA7

Minimize button

gsettings set org.gnome.desktop.wm.preferences button-layout ":minimize,maximize,close"

No logout prompt

gsettings set org.gnome.SessionManager logout-prompt false

rpm-ostree override remove noopenh264 --install openh264

This is better

rpm-ostree override reset noopenh264 --uninstall openh264
rpm-ostree install libavcodec-freeworld

curl -s https://raw.githubusercontent.com/zerotier/ZeroTierOne/master/doc/contact%40zerotier.com.gpg | sudo tee /etc/pki/rpm-gpg/RPM-GPG-KEY-zerotier

/etc/yum.repos.d/zerotier.repo

[zerotier]
name=ZeroTier, Inc. RPM Release Repository
baseurl=http://download.zerotier.com/redhat/fc/$releasever
enabled=1
gpgcheck=1

rpm-ostree install zerotier-one

rpm-ostree install \
https://mirrors.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm \
https://mirrors.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-$(rpm -E %fedora).noarch.rpm

rpm-ostree install VirtualBox

Virtualbox with the default Oracle packages does not work. Kernel driver is missing in Silverblue.

curl -s https://www.virtualbox.org/download/oracle_vbox_2016.asc | sudo tee /etc/pki/rpm-gpg/RPM-GPG-KEY-virtualbox

/etc/yum.repos.d/virtualbox.repo

[virtualbox]
name=Fedora $releasever - $basearch - VirtualBox
baseurl=http://download.virtualbox.org/virtualbox/rpm/fedora/$releasever/$basearch
enabled=1
gpgcheck=1

rpm-ostree install VirtualBox-7.2

grep -E '^vboxusers:' /usr/lib/group | sudo tee -a /etc/group
sudo usermod -aG vboxusers $USER

rpm-ostree install libvirt cockpit-system cockpit-ostree cockpit-machines

systemctl enable --now libvirtd

Run the Cockpit web service with a privileged container (as root):

podman container runlabel --name cockpit-ws RUN quay.io/cockpit/ws

Make Cockpit start on boot:

podman container runlabel INSTALL quay.io/cockpit/ws
systemctl enable cockpit.service

dconf write /org/gnome/Ptyxis/Profiles/$(dconf read /org/gnome/Ptyxis/default-profile-uuid | tr -d "'")/opacity 0.85

Copy your TTF fonts in .local/share/fonts (create the dir first)

Enable Flatpak app to write in homedir

flatpak override com.usebottles.bottles --user --filesystem=xdg-data/applications

Make flathub default

gsettings set org.gnome.software packaging-format-preference "['flatpak:flathub', 'flatpak', 'rpm']"

Where username is user you want to hide

/var/lib/AccountsService/users/username

[User]
.
.
SystemAccount=true

gsettings set org.gnome.settings-daemon.plugins.housekeeping donation-reminder-enabled false

Install from RPM and not flatpak

sudo rpm-ostree install steam gamescope

Gnome and fractional scaling results in strange full-screen resolutions. If it cannot be fixed in game settings add a launch option in Steam game. For example: this starts full screen with the resolution of 2560×1440 and a refreshrate of 240Hz and HDR enabled.

gamescope -f --hdr-enabled -W 2560 -H 1440 -r 240 --force-grab-cursor -- %command%

sudo rpm-ostree update --uninstall rpmfusion-free-release --uninstall rpmfusion-nonfree-release --install rpmfusion-free-release --install rpmfusion-nonfree-release

After reboot upgrade in GUI