Custom bottom buttons

[ᴶᵒʰⁿⁿʸ-ᴮᵒʸᶻ]

I used to be able to get custom bottom buttons went downloading certain themes however it stopped anyone idea what may have stopped it and what in possibly good luck or where else would you have stopped it from changing it is now set to default and will not change like it used to anyone have any ideas or is this as I knew update will not show custom bottom icons thanks for that in advance 🤔🙏👍

[Tourbillon De La Vie]

And how were those themes applied, using what app 

[ᴶᵒʰⁿⁿʸ-ᴮᵒʸᶻ]

Just themes from
Samsung store. Then applied

[Tourbillon De La Vie]

What theme was it? If you try it now does it say incompatible 

[ᴶᵒʰⁿⁿʸ-ᴮᵒʸᶻ]

Forest House Echo Visuals, Inc.

[ᴶᵒʰⁿⁿʸ-ᴮᵒʸᶻ]

Just applied through samsung main app clicked apply

[ᴶᵒʰⁿⁿʸ-ᴮᵒʸᶻ]

Cannot get it to return to what it was before. Could this be software related

[ᴶᵒʰⁿⁿʸ-ᴮᵒʸᶻ]

Still no joy after One UI7 update??