CAD tutorial: Why does the CAD layer still appear after it is closed?

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In the process of drawing drawings using Haochen CAD, after turning off one of the layers, the objects on this layer can still be seen. Why is this? How to solve this problem? Next, I would like to share with you the reasons and solutions for why the layers in the CAD tutorial still appear after they are closed! For example, the steps are as follows: 1. First open Haochen CAD, and then draw two sets of two straight lines (a total of four straight lines) ； 2. The set of straight lines on the left is the default CAD color (A) ； The set of straight lines on the right is a custom color (B), red, yellow, blue, any color can be used (it should be noted that create a new layer for this set of lines) ； As shown below: 3. Write block (W) commands for two sets of lines respectively ； Notice: Although they are all blocks, the lines in group A are blocks without layers, while the lines in group B are blocks with layer definitions. ； 4. After defining the block knot, remember the saved position for insertion ； 5. Insert two sets of blocks into the drawing interface respectively ； 6. Create two new layers, and then place the two sets of lines into the two new layers. ； 7. Block freezing separately ； 8. You will find that the line of item A can be frozen ； Item B lines cannot be frozen. Having said so much, I hope everyone can understand that because most of the blocks we usually insert are copied from other places, and most of the blocks are created in layers, they cannot be closed as a whole. Solution: The key to the problem is that the block you are using (maybe someone else's) is itself made on a different layer. Therefore, when you perform operations such as 'close' or 'freeze' on a certain layer, the command appears to be invalid on the graphics. The solution to the problem is: To find the original file of this tile yourself, open the image, change it to be on the same layer, and then rename the original tile file and save it. Reopen your graphic, insert your newly modified block, place it in a blank space, and then use this new block to completely replace the original block. Only then can you use the 'Purge' command. This way it can be solved once and for all. If you cannot find the original file, here is another trick for you: Copy the block in your picture that you suspect and place it in a blank space in the picture. I assume that you ask him to make a 'new look' and then change all entities in this 'new look' to a certain layer, then use this 'new look' as a block, give it another name, and then use the 'new look' block to do a global replacement. This will ensure that there are no old tiles in your picture, and then you can use the Purge command. The method I mentioned here seems very troublesome, but in fact only this can truly solve the problem. In fact, this situation is that the author of the original drawing was too clever and inadvertently did something stupid and violated the taboo of CAD drawing, that is,: When making blocks, you can only do them on one layer (preferably layer 0), and you can use different colors, but don't use different layers! In fact, many people have not noticed this problem. I am telling you here in the hope of attracting attention. The above are the reasons and solutions for the layers that still appear after closing in the Haochen CAD tutorial. I hope it will be helpful to everyone!