First enter the game, open the module on the start page, or open the module settings in the game menu setting

After opening, find this module in it, or just call a Z -character directly in the search bar below to directly out of this module

Select the module, click to search below to enter the following page

Click Elemental Grimoires in the second row to enter the following page

In the figure, Grimoires Can Cast Master Tier Spells means that the magic book can use the master -level magic. You only need to click the False key next to it to turn it to True to use the master -class magic. In the pictureYou can modify the value next to it to change the default magic value

After clicking, you will prompt to restart the game, restart the game to complete the change