Sometime you will get problems if you want to have everything collapsed in your forum.
These Ext e.g. 24 hour activity stats you want to have displayed, so that visitors can see that something is going on in the forum and register or log in

.
You should also consider which extensions you absolutely need in your forum.
Some styles and many extensions are very complex works and cannot be changed easily. Besides, they are not things for individualists but for all users.
Besides, more and more forum operators seem to have no idea how much work is behind all this, that all people do this in their spare time and most extensions and styles as well as the phpBB forum software and support are completely free. It's all taken for granted what it's not at all!
Note: All extensions must work correctly in standard style Prosilver. That is why the note:
Designed for Prosilver and Prosilver-based styles.
If the style author also adds customizations for other styles, this is a voluntary plus.
i want to be designed for digy style
Style adjustments of the various extensions have to be done by the user himself. Just like you have to make style changes yourself.