A slight design update gave OxygenOS 12 a more contemporary look. The menus and other features have less information density, and the interface’s bolder text makes it easier to understand overall. The neumorphism-based icons, which have been updated as well, have subtle shadows and gradients.
A themes store is now available in OxygenOS 12. To suit a user’s mood, OxygenOS 12 offers a variety of customization choices, including several themes from a store. This new capability does, however, have a cost. This new Theme Store was taken directly from ColorOS by OnePlus. The new Theme Store in OxygenOS 12 allows users to download and use different themes to modify the look and feel of your OnePlus phone while maintaining the same general layout and user interface as ColorOS. If utilizing elements from several operating systems isn’t your thing, stay away from it.
With the latest Oneplus theme app version 8.3 users are able to apply paid themes for free, Oneplus Theme app version 8.3 can be downloaded from the below links:
There are some of the best themes from OxygenOS 12 from Oneplus theme Store: Here