There are a number of places you can see the content that comes with your subscription:
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Library entry for D&D Beyond Drops Subscriber Content: https://www.dndbeyond.com/en/library/subscriber-content
The List is sortable by name, content type, and date.
Monsters, magic items, dice, and character options all have links to their respective entries, however the Maps, Drop-in Encounters, Reveals, and Stickers, are all only accessible via the Maps tool.
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Characters: https://www.dndbeyond.com/characters
To access character options associated with the D&D Beyond Drops Subscriber Content Library, Edit your Character, go to the "Home" tab of that character, then under the Character Preferences section, ensure you have the "Subscriber Content" Source checkbox checked.
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Maps: https://www.dndbeyond.com/games
In order to access the Drop-in Encounters and other Drops Maps, they can only be found in the Maps Tool. Just go to D&D Beyond Maps, Select your Game, then Open the Map Browser. From there, you can go to the D&D BEYOND DROPS dropdown to find what you're looking for.
You will also be able to see additional Stickers, Reveals, and Monsters in the usual places on Maps, under their respective "D&D BEYOND DROPS" sources.