Microsoft PowerPoint 16.0 Object Library Dissapear

Hi everyone, I’m automating PowerPoint with excel VBA. each time I add Microsoft PowerPoint 16.0 Object Library References, close the excel app, and open it again, The library is disappeared. Can anyone tell me the way to stick it with the excel app?

@Tu_n_Nguy_n Try this, open empty excel file and add Microsoft PowerPoint 16.0 Object Library References and save this file. You can later delete it. Now, try opening another excel file and see if the ref is added