The glyph is not a composition. Its width in East Asian texts is determined by its context. It can be displayed wide or narrow. In bidirectional text it is written from left to right. When changing direction it is not mirrored. The word that U+0435 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with one other glyph.
The Wikipedia has the following information about this codepoint:
E (Е е; italics: Ее), known in Russian and Belarusian as Ye, Je, or Ie, is a letter of the Cyrillic script. In some languages this letter is called E. It commonly represents the vowel [e] or [ɛ], like the pronunciation of ⟨e⟩ in "yes". It was derived from the Greek letter epsilon (Ε ε), and the shape is very similar to the Latin letter E or another version of E (Cyrillic).
Ye is romanized using the Latin letter E for Bulgarian, Serbian, Macedonian, Ukrainian and Rusyn, and occasionally Russian (Озеро Байкал, Ozero Baykal), Je for Belarusian (Заслаўе, Zaslaŭje), Ye for Russian (Европа, Yevropa), and Ie occasionally for Russian (Днепр, Dniepr) and Belarusian (Маладзе́чна, Maladziečna).