Game concept
Struggle Phase
The game also links it as Phase, Phases.
From the game's encyclopedia
A Phase is a general mood common to Involved Characters and Counties within a Struggle Region. It represents short-term societal trends and mores temporarily dominating the dialogue of the Struggle.
Example: in one Phase, the people of a Region may think that religious tolerance is paramount even if the rest of their faith disagrees.
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Struggle Phase is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "A Phase is a general mood common to Involved Characters and Counties within a Struggle Region." It is part of Struggle. The game also links it as Phase and Phases. Patch 1.20.1.2, from game/common/game_concepts/03_fp2_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/03_fp2_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.