WIO Terminal display issues

Products & Technology Wio Series
16

Here is a full example:

#include "TFT_eSPI.h"
TFT_eSPI tft(320, 240);
#define LCD_BACKLIGHT (72Ul)

void setup() {
    Serial.begin(115200);
    while(!Serial); // Wait for Serial to be ready
    tft.begin();
    tft.setRotation(3);
    digitalWrite(LCD_BACKLIGHT, HIGH);
    tft.fillScreen(TFT_BLACK);
}
 
void loop() {
    Serial.println("Filling black");
    tft.fillScreen(TFT_BLACK);
    delay(1000);
    Serial.println("Filling green");
    tft.fillScreen(TFT_GREEN);
    delay(1000);
    Serial.println("Turn off backlight");
    digitalWrite(LCD_BACKLIGHT, LOW);
    delay(1000);
    Serial.println("Turn on backlight");
    digitalWrite(LCD_BACKLIGHT, HIGH);
    delay(1000);
}

Uploading output:

Sketch uses 57712 bytes (11%) of program storage space. Maximum is 507904 bytes.
Device       : ATSAMD51x19
Version      : v1.1 [Arduino:XYZ] Mar 12 2020 17:43:33
Address      : 0x0
Pages        : 1024
Page Size    : 512 bytes
Total Size   : 512KB
Planes       : 1
Lock Regions : 32
Locked       : none
Security     : false
BOD          : false
BOR          : true
Write 58336 bytes to flash (114 pages)
[==============================] 100% (114/114 pages)
Done in 0.703 seconds
Verify 58336 bytes of flash
[==============================] 100% (114/114 pages)
Verify successful
Done in 0.140 seconds

Here is a video of it running with the serial monitor in the background: Dropbox - IMG_4540.MOV - Simplify your life

(It has some stuff from CircuitPython still on the screen, which never goes away.)