Tl;dr: Rush Duels.
On August 10th, 2021 (Tuesday), a new version will be available!
Update contents: Support for “Yu-Gi-Oh! Rush Duel” will be introduced!
You can use it while also toggling to the Yu-Gi-Oh! OCG mode!
*This requires downloading both the Yu-Gi-Oh! OCG and Yu-Gi-Oh! Rush Duel. it is also possible to selectively download only one of them.