Hi Steve, thanks for reaching out and thanks Muhammad for the great video tip you shared here!
Muhammad is right, you can use a conditional formula here to mass check rows. If you want all the columns checked to true you can just put "true" in the formula box as Muhammad showed in the video. If don't want every row checked, use the AI formula generatorto write a formula for the values you want checked!
Let me know if this makes sense and if you have any other questions!