You can restrict the number of object symbols to the number you require.
Procedure
In the mini toolbar, right-click the object symbol you want to remove.
Click Remove symbol.
The content of the mini toolbar is saved depending on the object type. The removed symbol is no longer displayed when you open the mini toolbar for objects of this type. If you open the mini toolbar for objects of a different type, the symbol is still displayed as long as you do not remove it for the object type.