Method 1

1. Merge
Merge all layers , obtain Merge
Data management tools —— routine —— Merge
6.45 second
2. buffer
（ Optional ） If you need a buffer , On the other hand merge Buffer to get buffer
Analysis tools —— Neighborhood Analysis —— buffer
3. Range layer ：
With buffer Create a range layer , obtain extent
3. erase
from extent erase buffer
Analysis tools —— Superposition analysis —— erase
3min38s
4. Split
Data management tools —— elements —— Multi part to single part
3min22s
After splitting, delete the feature of the outermost border to get the face gap

Method 2

1. Elements turn to face polygon（ Tolerance setting is supported ）
Data management tools —— elements —— Elements turn to face
12.82s
2. Merge
6.45s
3. erase
from polygon Erase merged features
3.63s

Result analysis

Method 1 In fact, it is one of the most popular online tutorials , But the process is cumbersome , And due to the range erasure, the original elements need to be merged , Takes longer , If the feature is closed with the border , It is easy to produce wrong gaps . Comprehensive, , Method 2 Process is simple , Short time , And more accurate