Google Ads Channel Reporting On Account Level
Briefly

Google Ads has extended Performance Max (PMax) channel reporting to the account level, enabling side-by-side analysis of multiple PMax campaigns within a single report. Advertisers can view channel breakdowns for several PMax campaigns on the same screen, reducing the need to open campaigns individually for comparison. Previously, channel reporting required selecting a specific PMax campaign. The account-level channel report surfaces channel metrics and facilitates performance comparison and optimization across campaigns. Google’s public wording suggests that channel reporting may be rolled out to additional campaign types in the future. A screenshot illustrates the account-level interface showing multiple PMax campaigns and channel metrics.
You can now analyze and compare multiple PMax campaings on the Account Level!
Also, Google's wording indirectly indicate that more campaigns might get a Channel Reporting,
PMax Channel Reporting used to be available only when selecting a specific PMax campaign.
This allows you to compare multiple PMax campaigns on the same screen, the same report.
Read at Search Engine Roundtable
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