Cant shrink back my achievement showcase to less rows

So basically I’ve bought this showcase lvl3 to write down some texts using game Zup!’s Achievements and when i just got it i could do like all 3 rows but i’ve done only 1 and other tho were empty so in profile it looked slick but when i chose to add more shit to it it became 3 rows and now i cannot remove them or make them empty which forces me to do this ugly way of putting some characters to fill the space which pisses me off so much. If you have any ideas how to fix this it would be really helpful