Hi lenzieman,
create one (or more) so-called "Setup Registrations" that contain all of your preferred settings. Then always after powering on the Tyros4, load the desired Setup Registration.
It is important that when memorizing the current panel settings for a Setup Registration, at least the checkmarks for Style, Voice, Multipad, Harmony, Tempo, Slider, Transpose and Scale are set in the "Memory" window. If you also want to (re)set the Pedal settings, check the Pedal box as well. If you are unsure, in this case tick more (or all) boxes than too few.
If you use always the same Fingering type and/or the same Split Points, go to "Function > Utility > Config 1 > 3 Parameter Lock" and make sure "Fingering" and/or "Split Point" is/are ticked here. (Usually "MasterEQ" should also be ticked here.) Finally press "EXIT" button to save your changes (!)
Best regards,
Chris