When typing on the Samsung keyboard, whether or not the alternate characters are enabled, a character preview is displayed, and the typed letter is enlarged in a pop-up.

If "Keep symbol panel open" is not desired, it can be disabled in the settings.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  General management
Step 3:  Tap on  Language and input
Step 4:  Tap on  On-screen keyboard
Step 5:  Tap on  Samsung Keyboard
Step 6:  Tap on  Swipe, touch, and feedback
Step 7:  Enable or disable  Keep symbol panel open
  1. Open the Settings
  2. Tap on General management
  3. Tap on Language and input
  4. Tap on On-screen keyboard
  5. Tap on Samsung Keyboard
  6. Tap on Swipe, touch, and feedback
  7. Enable or disable Keep symbol panel open

Samsung Instructions
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