Explanation:

Box 1: Rule1 tip only
File1 matches Rule1, Rule2, and Rule3.
Rule1 has the highest priority.
Note: The Priority parameter specifies a priority value for the policy that determines the order of policy processing. A lower integer value indicates a higher priority, the value 0 is the highest priority, and policies can't have the same priority value.
Box 2: Rule1 tip only
Note: User Override support
The option to override is per rule, and it overrides all of the actions in the rule (except sending a notification, which can't be overridden).
It's possible for content to match several rules in a DLP policy or several different DLP policies, but only the policy tip from the most restrictive, highest-priority rule will be shown (including policies in Test mode). For example, a policy tip from a rule that blocks access to content will be shown over a policy tip from a rule that simply sends a notification. This prevents people from seeing a cascade of policy tips.
If the policy tips in the most restrictive rule allow people to override the rule, then overriding this rule also overrides any other rules that the content matched.
Reference:
https://learn.microsoft.com/en-us/microsoft-365/compliance/dlp-overview-plan-for-dlp
https://learn.microsoft.com/en-us/microsoft-365/compliance/use-notifications-and-policy-tips