There is not much to configure in KLWP to have all the functionality of the theme. Just note the following:
Give all possible permissions when KLWP requests (location access, notifications and so on);
In the KLWP settings, change the first day of the week to "Sunday" (if this is not done, the calendar may not work correctly);
For the Fitness machinery to work, it is necessary to have Google Fit installed: therefore, install it and configure it (and use the same account that you used on it in KLWP when requested);
To be able to add 24 application icons, configure your Launcher for three screens: in each one of them, there will be 8 icons.
Note: Regarding the choice of screen aspect ratio, there are three options within the theme: 16 x 9, 18 x 9 and 19,5 x 9. After configuring the aspect ratio in KLWP, change the global variable "Propor", choosing the correct aspect ratio. By default, 16x9 will be selected.