This article teaches you how to prevent your contacts from seeing that you are using the Imo.im application; although it is no longer possible to activate the "invisible" function, you can temporarily block a contact to prevent him from sending you a message or understanding your status.
Steps
Method 1 of 2: on Mobile Device

Step 1. Open the Imo application

Step 2. Tap the Chat section
You can find it in the upper right corner.

Step 3. Select the conversation with the person you want to block

Step 4. Tap the contact name that appears in the upper left corner of the screen
Next to the name there is also an arrow pointing to the left.

Step 5. Scroll down the screen and select the Lock button

Step 6. Tap the OK button to confirm
At this point, the person can no longer see when you are using the application.
- When you want to restore the contact, tap the key ☰ located in the lower left corner, select Settings, Contacts blocked then touch Unlock.
- You have to repeat the sequence for all the people you want to block or unblock.
Method 2 of 2: Windows

Step 1. Open Imo.im application for Windows computer
When you want to block a contact from this platform, you must first remove it; this means that when you put it back in the address book, the person will receive a notification. If you want to temporarily make yourself invisible without the individual knowing, you have to opt for the method described above

Step 2. Click on the Chat button

Step 3. Right-click on the conversation you have had with the contact you want to block

Step 4. Select Remove from Address Book

Step 5. Click OK to confirm the action

Step 6. Click on the conversation again
A message should appear at the top of the screen that says "This person is no longer in your address book".

Step 7. Select Block
Now the person can no longer see that you are online.
- When you want to restore your contacts, click on the menu imo located in the upper left corner of the screen and select Blocked users; click on the button Unlock adjacent to the person's name.
- You have to repeat the process for all the contacts you want to block or unblock.