The only UI element where a breakdown of modifiers can be seen is when hovering job production. However, there are bonuses with effects like "+15% monthly unity" example: Beacon of Liberty. I think this bonus is represented in the UI when hover the production of jobs as: "Empire unity_icon +15%" It gets added to other such modifiers but it's not apparent which. In the screenshot of a freshly started game, this bonus is +45%. +20% from Fanatic Spiritualism, +15% from Brand Loyalty = 35%. The last 10% I don't know where it comes from. It's nothing I can find in the UI. My question is, since this "Monthly Unity" bonus is additive to job production, does it even apply the bonus to things like Unity from trade, or factions? There is as far as I know, no way to get a breakdown of modifiers affecting the unity from trade value in the UI. I feel like it should, but I don't know.
As an aside, I feel like the "Monthly Unity" modifier should be multiplicative, in that it should add all monthly unity incomes and expenses together first, from jobs, trade, factions, leaders, then apply the modifier to the net income. That's how it works with Prestige in CK3. I know Stellaris almost always has additive modifiers, but with the name of "Monthly Unity" it would make more sense to me.
As an aside, I feel like the "Monthly Unity" modifier should be multiplicative, in that it should add all monthly unity incomes and expenses together first, from jobs, trade, factions, leaders, then apply the modifier to the net income. That's how it works with Prestige in CK3. I know Stellaris almost always has additive modifiers, but with the name of "Monthly Unity" it would make more sense to me.