The predictive text feature can sometimes impede users unfamiliar with this functionality, making text input a challenging task.
Disable predictive text on Samsung Galaxy J2 Pro 2018 with the following guide:
Step 1: Access settings and choose general management.

Access settings and choose general management.
Step 2: Select language and keyboard.

Choose language and keyboard.
Step 3: Select on-screen keyboard.

Select the on-screen keyboard.
Step 4: Choose the Samsung keyboard.

Choose the Samsung keyboard.
Step 5: Disable predictive text.

Turn off predictive text.
The setup process is now complete. Wishing you all success.