What does "理所应当的美好" mean?
享受一切理所应当的美好 = enjoy all the beauty you deserve

Here, 'beauty' refers to the nice features that Mac and Sogou provide.

However, this expression seems to be a little bit strange. Usually, we do not put the word 理所应当的 before a noun. For example, instead of saying '这是理所应当的美好', one should say '这份美好是理所应当的'.