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Before disk and partition selection
This is the initial view of the anaconda installation summary screen.
What is important here is the Storage Installation Destination, click that to select the disks and partitions where Fedora is to be installed. You can also change the timezone and keyboard layout if necessary - but note that changing the keyboard here has no affect on the installation process itself.
If you want to change the keyboard layout for that, you have to use the normal tools - go to the application menu and type Language, then select the Region and Language utility program, and use the Input Sources tab to select a new layout.