In safari I have mapped ⌘1 to 'Show Previous Tab' and ⌘2 to ’Show Next Tab’ through the macOS system menu. This is not possible in Orion as these settings seem overwritten.
If the Use ⌘1 to ⌘9 to switch tabs option in Orion is checked, pressing ⌘1 shows tab 1 while pressing ⌘2 shows tab 2.
If the Use ⌘1 to ⌘9 to switch tabs option in Orion is unchecked, pressing ⌘1 opens bookmark 1 while pressing ⌘2 opens bookmark 2.
Pressing ⌘1 shows previous tab while pressing ⌘2 shows next tab.
Users should be able to overwrite keybindings to improve flexibility.