There are two drives u8g2 and DFRobot_GDL are provided, should I install both of them?

Name: Fermion: Monochrome 0.96" 128x64 I2C/SPI OLED Display (Breakout)
Brand: DFRobot
SKU: DFR0650
Price: 14.5 USD
Availability: InStock
Rating: 5.00 (2 reviews)

You just need to select one to install. Please note that u8g2 is a powerful lcd library for black and white liquid crystals, and thre are functions like built-in capacitive resistance touch, simple UI and u8g2 partial functions in DFRobot_SDL, it supports both black and white, and colorful LCD.

Fermion: Monochrome 0.96

Introduction

This 0.96” OLED display module uses the SSD1306 drive chip, has 128x64 self-illuminating white pixels, and adopts two communication methods: SPI/ I2C, I2C in default. With its high contrast, simple wiring and low power consumption, it can be applied to many display applications, such as wearable display devices, Mini small game consoles, desktop widgets, etc.

This 0.96” OLED display module supports both 3.3V and 5V. The display module adopts a high-contrast, low-power OLED display. It is compatible with controllers such as Arduino UNO, Leonardo, ESP32/ESP8266, FireBettle-M0 and so on. Internal power-on reset processing, I2C communication methods, so that your welding line will be more convenient and simpler. If you want to change I2C communication to SPI, you just need to change the resistor position. In addition, the display is in an aluminum frame package that protects the screen from damage, and also prevents you from scratching that caused by the glass edge of the screen.

Note: Turn the pixels off when you are not using the display to prevent the use of some pixels too long to darken them, which will cause the brightness uniformity problem.